Database Develop

"Awaiting cellular service...." Never finds it. Need help.

Hey all, this all started a few days ago, I had gotten into the Android beta so I could get Nougat. It was running fine for a few days, maybe a week. Then after I rebooted the phone for something, it wasn't finding my cell network. I decided now was as good a time as any to root it and see what ROMs were out there, it had been a few years and I had never rooted my Nexus 6.
I installed Pure Nexus and it was all good for a day or so, then my phone kept telling me it wasn't rooted. Not sure how that happens, but whatever, I decided to go through the steps again and root it and make sure it was all good. Ever since then it has unable to find my cell network. It sticks on the initial search for the network when I boot up my phone. I'm on T-Mobile with a Nexus 6.
In Cellular network settings it can't seem to decide if it's supposed to use GSM or CDMA, keep jumping back and forth. As such "Access Point Names" disappears then reappears. Either way, it's blank. I've even manually added an APN according to T-Mobile's website, but it disappeared once it switched back to CDMA and back.
I've taken the SIM card out, put it back in, no luck. I've wiped, I've rolled back to my nandroid backup, I even used Nexus Root Toolkit to flash stock and unroot, still not finding my cell service. Any suggestions/thoughts?
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Beaupedia said:
Hey all, this all started a few days ago, I had gotten into the Android beta so I could get Nougat. It was running fine for a few days, maybe a week. Then after I rebooted the phone for something, it wasn't finding my cell network. I decided now was as good a time as any to root it and see what ROMs were out there, it had been a few years and I had never rooted my Nexus 6.
I installed Pure Nexus and it was all good for a day or so, then my phone kept telling me it wasn't rooted. Not sure how that happens, but whatever, I decided to go through the steps again and root it and make sure it was all good. Ever since then it has unable to find my cell network. It sticks on the initial search for the network when I boot up my phone. I'm on T-Mobile with a Nexus 6.
In Cellular network settings it can't seem to decide if it's supposed to use GSM or CDMA, keep jumping back and forth. As such "Access Point Names" disappears then reappears. Either way, it's blank. I've even manually added an APN according to T-Mobile's website, but it disappeared once it switched back to CDMA and back.
I've taken the SIM card out, put it back in, no luck. I've wiped, I've rolled back to my nandroid backup, I even used Nexus Root Toolkit to flash stock and unroot, still not finding my cell service. Any suggestions/thoughts?
Click to expand...
Click to collapse
If you have access to another SIM card I would try that. If you acquire a signal with another SIM card the one you have is bad. You could even try removing and reinstalling your current SIM card to see if that helps.

Flash factory images with out a sim and do a complete boot. I had issues coming to T-Mobile from Sprint on my n6. After first boot power down and insert sim, then boot. It should auto detect the APN settings.
Sent from my Nexus 6 using XDA Free mobile app

^ This
If that still doesn't work, you could try flashing a different radio image from here: http://forum.xda-developers.com/nexus-6/development/fxz-nexus-6-recovery-flashable-fastboot-t3066052

Any luck?
Sent from my Nexus 6 using XDA Free mobile app

31ken31 said:
Flash factory images with out a sim and do a complete boot. I had issues coming to T-Mobile from Sprint on my n6. After first boot power down and insert sim, then boot. It should auto detect the APN settings.
Sent from my Nexus 6 using XDA Free mobile app
Click to expand...
Click to collapse
aroy97 said:
^ This
If that still doesn't work, you could try flashing a different radio image from here: http://forum.xda-developers.com/nexus-6/development/fxz-nexus-6-recovery-flashable-fastboot-t3066052
Click to expand...
Click to collapse
31ken31 said:
Any luck?
Sent from my Nexus 6 using XDA Free mobile app
Click to expand...
Click to collapse
Thanks everyone. I tried all of the suggestions, the first flashing without a sim, didn't work. I just wrapped up trying a new radio image, no luck there either.
Thinking it's probably just hardware, so bummed. Any other thoughts?
Thanks for checking in 31ken31.

Have ya tried and other known working sim cards on att or something to see if it finds that
Sent from my Nexus 6 using XDA Free mobile app

Just updating this in the event someone is routed to it through Google in the future. After flashing, trying to new sims, etc. it was pretty much guaranteed to be a hardware issue. The sim card reader is just not reading the sim cards. I upgraded to an LG V20 and am in love! Thanks for everyone who tried to help.

VoLTE bug

I have a Jio 4g sim in slot one. I can access internet just fine but when I try to make a call it says " call failed, try another method"
I have an idea 3g sim in slot 2. After searching online I found solutions like swap Sims (already done that), try sim in another phone (volte calling works fine on other phone) and wiping cache ( done, no luck)
Is it true that the December update broke the volte functionality? I just bought the phone so I don't know much about that but there are a lot of people facing the same problem it seems, going by all the complaints on forums
How do I fix this?
Ps: calling via the jio4g voice app works fine

blueblast said:
I have a Jio 4g sim in slot one. I can access internet just fine but when I try to make a call it says " call failed, try another method"
I have an idea 3g sim in slot 2. After searching online I found solutions like swap Sims (already done that), try sim in another phone (volte calling works fine on other phone) and wiping cache ( done, no luck)
Is it true that the December update broke the volte functionality? I just bought the phone so I don't know much about that but there are a lot of people facing the same problem it seems, going by all the complaints on forums
How do I fix this?
Ps: calling via the jio4g voice app works fine
Click to expand...
Click to collapse
I am with December's security patch and VoLTE works fine here.
Just confirm, "enhanced 4G LTE mode" is enabled in network settings..

Enhanced 4G option is unavailable ?

blueblast said:
Enhanced 4G option is unavailable
Click to expand...
Click to collapse
Where you checked ?
Settings > more > cellular networks. It's there.
Try to remove sim and insert sim-1 only and check..

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You can see the screenshots
One with jio only, one with jio in slot 1 and idea in slot 2, last with other way round

blueblast said:
You can see the screenshots
One with jio only, one with jio in slot 1 and idea in slot 2, last with other way round
Click to expand...
Click to collapse
Next thing is factory reset. If jio4gvoice is working, then you can use it for now, and in time try factory reset..

Just did factory reset
No change

same here bro

Version nps26.116-61?
Sent from my Moto G5S Plus using XDA Labs

Yep
---------- Post added at 01:09 PM ---------- Previous post was at 01:09 PM ----------
Adi5 said:
Version nps26.116-61?
Sent from my Moto G5S Plus using XDA Labs
Click to expand...
Click to collapse
Yep

Any solutions to volte problem?
I'm not able to use VoLTE but my brother can, both on Moto G5S Plus. Only difference is that he's on stock rom and I've tried all sorts of custom roms including AEX, Cosmis, RR, PE etc. But I couldn't get VoLTE working on any of them.
I haven't tried VoLTE when I had stock rom, so can't say if its due to OS or some other problem.

What's wrong with my moto G5s+ ? I also experienced an incident like this after flash stock rom 61-2.
blueblast said:
You can see the screenshots
One with jio only, one with jio in slot 1 and idea in slot 2, last with other way round
Click to expand...
Click to collapse

Check the MNC in access point setting...
If it's a 2 digit no.
Ask for duplicate sim card...
I had this problem.. Asked for duplicate sim card..n now Volte is working....

My volte was working fine but one day when i was out of coverage area I got a msg that your calling service has been banned ..and after the my volte never work with that same sim again but when I try other sim it worked ... Whats wrong???

rannyak47 said:
My volte was working fine but one day when i was out of coverage area I got a msg that your calling service has been banned ..and after the my volte never work with that same sim again but when I try other sim it worked ... Whats wrong???
Click to expand...
Click to collapse
Contact your carrier

Phazmos said:
Contact your carrier
Click to expand...
Click to collapse
What u mean mobile company or sim company ?

rannyak47 said:
What u mean mobile company or sim company ?
Click to expand...
Click to collapse
Whoever you paid for the sum

Asus ROG II (Tencent) NO 4G/LTE connection - Please Help!

Hi All,
First off all a thank you in advance for any assistance given.
I purchased my beloved phone from DX.com, it came down from Singapore so i knew a gamble was being taken. I received my phone a couple of weeks later, and i couldnt get 4G. Everything else worked fine.
What i've done so far:
I have checked every setting under the sun to see if could enable 4G, every setting ive come across seem to be ok.
I have contacted my network provider and everything is fine on their end, (the sim was working fine on my previous phone)
I have check my fingerprint and phone details to check if everything is compatible, and i also updated my WW version to the latest. - see details here
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I cannot get 4g to work at all and im thining of sending the phone back and purchase from asus them selves and just brunt the cost in the chin. Any help would be apreciated.

TugainUk said:
Hi All,
First off all a thank you in advance for any assistance given.
I purchased my beloved phone from DX.com, it came down from Singapore so i knew a gamble was being taken. I received my phone a couple of weeks later, and i couldnt get 4G. Everything else worked fine.
What i've done so far:
I have checked every setting under the sun to see if could enable 4G, every setting ive come across seem to be ok.
I have contacted my network provider and everything is fine on their end, (the sim was working fine on my previous phone)
I have check my fingerprint and phone details to check if everything is compatible, and i also updated my WW version to the latest. - see details here
I cannot get 4g to work at all and im thining of sending the phone back and purchase from asus them selves and just brunt the cost in the chin. Any help would be apreciated.
Click to expand...
Click to collapse
Going from your user name, you live in UK? Depends what network you're on, this phone has no band 20. Which is fine if you're on ee, but other networks use band 20 for 4g... Google which network bands your provider use

TugainUk said:
Hi All,
First off all a thank you in advance for any assistance given.
I purchased my beloved phone from DX.com, it came down from Singapore so i knew a gamble was being taken. I received my phone a couple of weeks later, and i couldnt get 4G. Everything else worked fine.
What i've done so far:
I have checked every setting under the sun to see if could enable 4G, every setting ive come across seem to be ok.
I have contacted my network provider and everything is fine on their end, (the sim was working fine on my previous phone)
I have check my fingerprint and phone details to check if everything is compatible, and i also updated my WW version to the latest. - see details here
I cannot get 4g to work at all and im thining of sending the phone back and purchase from asus them selves and just brunt the cost in the chin. Any help would be apreciated.
Click to expand...
Click to collapse
My tuppenceworth, I'm on 3uk, and have no issues with 4g. I bought my rog2 direct from ASUS.
I have noticed some slight oddities between the sim slots though. Ie, my pin protected sim doesn't prompt me for the pin in tray 1. It just doesn't work. When I put it in tray 2, all works as it should. Have you tried swapping to tray 2? Failing that, you might just need a new sim?
EDIT. Just noticed you have tencent hardware, so all this advice may well be irrelevant.

I bought my from Asus, sure it had 4g to start with. Did an update and now it doesn't work.
I'm on vodafone in the UK

Update - 4g works at home. Weird as 4g was always ok on other phones at work. Must be a weaker pick up on this phone?

Odd at work, if I have phone set to 2g/3g/4g it sits on EDGE. If I put it on 2g/3g I get H+
You'd think the first would sit on H+
Annoying having to change the setting

i feel this phone 4g very week compare to my old pocophone....

Too many WiFi antennas and not enough 4g antenna? Guess it won't ever be a software fix?
Phones great, just super annoying at work I can't get 4g inside.
Go out the door and it's 4g no problem.
Everyone's iPhones, Samsung's etc.... All get 4g, just not me

LG G8 AT&T got Android 12 update, but be careful!

I just updated my G8 AT&T unlocked phone from A10 to A12 today. Initially, I was excited when AT&T pushed the updates. Later on, I found that I cannot make/receive calls (text and data are still working). Then I dialed *#*#4636#*#* and found that the volte is not provisioned. But in A10, it was provisioned. So frustrated now...
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Does anyone know how to solve this issue? Thanks!
UPDATES:
I finally solved the problem by cross flashing my LG G8 to US OPEN firmware. Now with H2O, or RP GSMT/GSMA, everything works perfect so far. I believe ATT intentionally disables volte, making the phone virtually 'locked' to ATT only sim card (I have tried FreedomPop, redpocket GSMA and GSMT, Boost, H2O sim cards, none of them worked before flashing).

I currently have the same issue and you are the only person I can find asking about it. So have you had any luck?

FadeOut2006 said:
I currently have the same issue and you are the only person I can find asking about it. So have you had any luck?
Click to expand...
Click to collapse
Changing the sim card could be a solution. I have tried sim cards from several mvnos, seems that only the ATT prepaid card works. Others reported the Boost sim card also works.

Hmm. So, I should definitely hold off on upgrading to Android 12? Because everything is working perfectly with Android 11 right now. Have you tried US Mobile?

Gurren Lagann said:
Hmm. So, I should definitely hold off on upgrading to Android 12? Because everything is working perfectly with Android 11 right now. Have you tried US Mobile?
Click to expand...
Click to collapse
But if your sim card works with Android 11, it may work with Android 12. Anyway, I just found It worked perfectly with my H2O sim card on Android 10, not working on android 12. I tried H2O, red pocket, tracfone, att, mint.

rrhhuutt said:
But if your sim card works with Android 11, it may work with Android 12. Anyway, I just found It worked perfectly with my H2O sim card on Android 10, not working on android 12. I tried H2O, red pocket, tracfone, att, mint.
Click to expand...
Click to collapse
Have you tried US Mobile? That's what I have but I am afraid to upgrade to Android 12 when it comes out. I am hearing things like people are unable to make or receive calls. Or the Wi-Fi Calling feature is greyed out. I don't want to risk it.

Shawn R said:
Have you tried US Mobile? That's what I have but I am afraid to upgrade to Android 12 when it comes out. I am hearing things like people are unable to make or receive calls. Or the Wi-Fi Calling feature is greyed out. I don't want to risk it.
Click to expand...
Click to collapse
OK---I just did the update. No WiFi calling & no calling period..... I had an ATT sim card laying around--put it in & ---you guessed it....WiFi calling came up--couldn't try a call (no network available--old sim)--but I tried my sim (Consumer Cellular--ATT reseller) & NOTHING. I'm looking for a 10 image so I can roll the phone back.....
The Consumer Cellular sim worked with 10...no WiFi calling with 11 & nothing with 12.

debianmain1 said:
OK---I just did the update. No WiFi calling & no calling period..... I had an ATT sim card laying around--put it in & ---you guessed it....WiFi calling came up--couldn't try a call (no network available--old sim)--but I tried my sim (Consumer Cellular--ATT reseller) & NOTHING. I'm looking for a 10 image so I can roll the phone back.....
The Consumer Cellular sim worked with 10...no WiFi calling with 11 & nothing with 12.
Click to expand...
Click to collapse
I believe this site has what you're looking for: https://lg-firmwares.com/
Now I am definitely not going to upgrade.

Shawn R said:
I believe this site has what you're looking for: https://lg-firmwares.com/
Now I am definitely not going to upgrade.
Click to expand...
Click to collapse
Yes---I have that one bookmarked......no ATT ROMs, but you can get the US_OPEN ROMs...If I don't resolve this in a week or so, I'm going to cross-flash to 20H using the no root guide...It works pretty well. I'm on my backup G7 now, so I have time to experiment.
You wouldn't want to image your phone & post it---would you?

rrhhuutt said:
I just updated my G8 AT&T unlocked phone from A10 to A12 today. Initially, I was excited when AT&T pushed the updates. Later on, I found that I cannot make/receive calls (text and data are still working). Then I dialed *#*#4636#*#* and found that the volte is not provisioned. But in A10, it was provisioned. So frustrated now...
View attachment 5713227
View attachment 5713225
Does anyone know how to solve this issue? Thanks!
UPDATES:
I finally solved the problem by cross flashing my LG G8 to US OPEN firmware. Now with H2O, or RP GSMT/GSMA, everything works perfect so far. I believe ATT intentionally disables volte, making the phone virtually 'locked' to ATT only sim card (I have tried FreedomPop, redpocket GSMA and GSMT, Boost, H2O sim cards, none of them worked before flashing).
Click to expand...
Click to collapse
Are you saying that WiFi Calling works for US_OPEN? As I understand it--that is a Verizon ROM?

debianmain1 said:
Yes---I have that one bookmarked......no ATT ROMs, but you can get the US_OPEN ROMs...If I don't resolve this in a week or so, I'm going to cross-flash to 20H using the no root guide...It works pretty well. I'm on my backup G7 now, so I have time to experiment.
You wouldn't want to image your phone & post it---would you?
Click to expand...
Click to collapse
I have the LG G8 ThinQ G820TM (T-Mobile Unlocked) running Android 11. Is this compatible with yours?

debianmain1 said:
Are you saying that WiFi Calling works for US_OPEN? As I understand it--that is a Verizon ROM?
Click to expand...
Click to collapse
Wifi-calling depends also on sim cards, my RP GSMT and ATT sim cards have wifi-calling enabled, but not H2O's.
The rom is: G820QM30c_00_NAO_US_OP_0103.kdz

Shawn R said:
I have the LG G8 ThinQ G820TM (T-Mobile Unlocked) running Android 11. Is this compatible with yours?
Click to expand...
Click to collapse
Well---I was hoping for an ATT Image....The T-Mo0bile will work, but I would have to cross-flash it anyway....THANK YOU. I'll most likely use the cross-flash guide posted here---it works very well.

rrhhuutt said:
Wifi-calling depends also on sim cards, my RP GSMT and ATT sim cards have wifi-calling enabled, but not H2O's.
The rom is: G820QM30c_00_NAO_US_OP_0103.kdz
Click to expand...
Click to collapse
I know that my sim was using WiFi Calling with 10---so I'm going to either do a downgrade with an ATT image if I can find one or cross flash to either T-Mo or Verizon ROM.

debianmain1 said:
I know that my sim was using WiFi Calling with 10---so I'm going to either do a downgrade with an ATT image if I can find one or cross flash to either T-Mo or Verizon ROM.
Click to expand...
Click to collapse
So, how does someone extract the image from their phone? I had a LG G3, G4, and G6 a few years ago. And I put TWRP on all three. I know that with TWRP I can backup the image but I'm kinda scared to put it on my G8 because it could cause all kinds of problems. Wouldn't I have to unlock the bootloader and erase everything off my phone?

Big big issues in Android 12 with reception and connectivity, please refer to my other topics, they REMOVED THE CARRIER AGGREGATION TOGGLE completely rendering the phone utterly slow on networks outside of Korea for my N version and the same can be said for others.
It's really sad and trust me, i've been trying for a solution.
For more info refer to my topic: https://forum.xda-developers.com/t/...-kt-please-help-me-lol.4506203/#post-87580253
And this post: https://forum.xda-developers.com/t/...s-opid-mismatched-error.4345963/post-87590409
The issue is in that the devs just took out so much code I think when it comes to the snapdragon modem, it's really dumb.
There needs to be a solution, I want to email LG but yeah... they are dead... maybe there are like 3 devs still there doing some work but realistically they don't care, they're probably just like : just buy a p7 or 14 pro man...
FRUSTRATING!
This phone would be so much better if I could get CA to work ffs..

Shawn R said:
So, how does someone extract the image from their phone? I had a LG G3, G4, and G6 a few years ago. And I put TWRP on all three. I know that with TWRP I can backup the image but I'm kinda scared to put it on my G8 because it could cause all kinds of problems. Wouldn't I have to unlock the bootloader and erase everything off my phone?
Click to expand...
Click to collapse
Well--if you look at the cross-flash thread....you can just pull the information from the partitions without erasing them---you get to copy them as they are at the time you do it (I found you need to rename the files--the software used creates rather cryptic file names).....I have looked at & used this method--it works, but you need to be VERY CAREFUL during this or you could do real damage to the phone. I pulled all the partition information from another phone--deleted the information that prevents a cross-flash & installed a different ROM on the phone...so I can say that it works VERY well--I even restored one partition from the old ROM to maintain the serial# of the phone.

debianmain1 said:
Well--if you look at the cross-flash thread....you can just pull the information from the partitions without erasing them---you get to copy them as they are at the time you do it (I found you need to rename the files--the software used creates rather cryptic file names).....I have looked at & used this method--it works, but you need to be VERY CAREFUL during this or you could do real damage to the phone. I pulled all the partition information from another phone--deleted the information that prevents a cross-flash & installed a different ROM on the phone...so I can say that it works VERY well--I even restored one partition from the old ROM to maintain the serial# of the phone.
Click to expand...
Click to collapse
What partition do you need to restore from the old ROM to maintain the serial number? I had issues last time I tried cross flashing, and I think I missed this step.

nortnil said:
What partition do you need to restore from the old ROM to maintain the serial number? I had issues last time I tried cross flashing, and I think I missed this step.
Click to expand...
Click to collapse
The info is in the thread--I don't remember right now....

Hello, I never used WiFi calls and VOLTE never worked on this phone. In july, I both updated to A12 and switched to a new carrier. problem is phone calls have poor quality voice as there is no VoLTE and 4G/LTE bandwith is terrible since I switched. I wanted to follow your instructions and go to the enginnering menu BUT dialing *#*#4636#*#* just makes the number disappear and nothing happens.. Do you have any clue of how to access it ?
Also, I went to *#546368#*820# --> SVC Menu --> VoWiFi --> switched Wi-Fi Calling Toggle form 0 to but.... nothing changed. Not options int the 3dots phone options and no new shortcut to add in the slide menu. Do you have any clue ?
I just found that you can change the "VoLTE quality" in the " dots phone menu section with "automatic/suppress/blur" options. I will try suppress to see if it's better.

Question No Simlock, No mobile Data Help please

Hello to all specialists, . I have the following problem with my S21 Ultra 5G (I do not know the provider before) the problem refers to mobile data that I simply do not get activated. I installed a new Rome from Samfw.com via Odin. I tried all providers here in Germany, but nothing was reached except recently at Telekom (T-Mobile). The smartphone does not require a simlock. Is it in the settings?. The card is recognized and WLAN telephony is also possible. At first I thought that it might be blocked, but I bought a unlock code from Handy-Entsperren24.de, I am now sitting on this problem all the time and does not depend on what it could be, I had another ROM before on it, which was compatible with Vodafone and Telekom and Euro. I hope you have a suggestion that this problem is finally helped. I looked on YouTube and in Google I looked for the problem forever, but I found nothing in this regard. Many greetings your Ingo.
Here are some data:
Model Name: Galaxy S21 Ultra 5G SM-G998B/DS
Model code: SM-G998BZKDDBBT
Model Brand: Samsung G998BXXU6EWAF
ESIM Supported: NO
ESN status: clean
Telephone status: officially
If there is a thread that resembles mine, then I ask for the link.
NOBODY HELPS???

Install e.g. Network Cell Info Lite & WiFi and see if you can see the masts.

does calling and all other functions work fine? is it only mobile data that is not connecting?

I also don't get a hotspot/homespot. Only the mobile data does not work, the photo.
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@
st3chn0, yes...​

Turn off wifi and watch the "data" tab when connecting to the network.
Are you using one sim or two at the same time?
Are the settings in apn on your phone consistent with those of your sim card provider?

Yes, I use my provider's settings. A SIM card no matter 1 or two, the same everywhere. The provider of mine is normal here.

looks like you dont have any signal. im guessing calling is only working on wifi?
have you tried your sim in another phone?
maybe worth just reflashing the firmware, possibly a bad update?

samingo said:
Yes, I use my provider's settings. A SIM card no matter 1 or two, the same everywhere. The provider of mine is normal here.
Click to expand...
Click to collapse
I suspect RIL failure or worse, hardware failure of the radio.
Still try to make a call to the emergency number 112 and immediately disconnect if a call is made.

So I switched off the WLAN telephony, tried emergency call 112 and I didn't get through. It was only "called", but as already mentioned, nothing happened. I really don't know what to do, I also tried 3 different stocks. (Vodafone, Telecom and of course euros). Does anyone have a tip because I think a new Rome may not do anything? Before that, I had already converted the SIM card to an ESIM, but nothing happened, it is always just the mobile data that does not show any function. The card works in my old cell phone Xioami.

Have you just brought the device?
couple of possibilities and resolution
1- Software issue - use odin to reflash the firmware (make sure you use the official or trusted cable)
2 - network blocked device - you'll need to call your operator to check whether this is the case
3 - Hardware issue - get it repaired by samsung

samingo said:
So I switched off the WLAN telephony, tried emergency call 112 and I didn't get through. It was only "called", but as already mentioned, nothing happened. I really don't know what to do, I also tried 3 different stocks. (Vodafone, Telecom and of course euros). Does anyone have a tip because I think a new Rome may not do anything? Before that, I had already converted the SIM card to an ESIM, but nothing happened, it is always just the mobile data that does not show any function. The card works in my old cell phone Xioami.
Click to expand...
Click to collapse
We are not talking about SIM. Calling the emergency number should also work without any SIM in the phone. Since it does not work and you tried to upload other original firmware, the diagnosis is clear: a damaged radio module. Only replacing the motherboard will help, which in fact may be unprofitable.

I now get a call from Samsung for repair. Let's see what that costs. Thanks for the information, if you can think of something else that can still be remembered, I would be happy to receive any answer.

I did so installed trwp I did full wipe. Then I uploaded the system again through Odin and everything works
Before android install 13, imei (null) (imei is empty) no signal.

samingo said:
I now get a call from Samsung for repair. Let's see what that costs. Thanks for the information, if you can think of something else that can still be remembered, I would be happy to receive any answer.
Click to expand...
Click to collapse
Did you exactly follow the steps as shown in the video?

ze7zez said:
Did you exactly follow the steps as shown in the video?
Click to expand...
Click to collapse
I tested this patch on my phone it did not solve my problem

cwiara77 said:
I did so installed trwp I did full wipe. Then I uploaded the system again through Odin and everything works
Before android install 13, imei (null) (imei is empty) no signal.
Click to expand...
Click to collapse
First, how do you know that the case of the author of the thread is identical to your problem?
Second, don't force the thread author to remove the knox security irrevocably after flashing custom recovery.

So I didn't install any new firmware. And with stack 1, as you can see, there are only bugs.
Do you have any suggestions or do you really think hardware failures are occurring? With the motherboard of the S21 Ultra, costs almost as much as a new one?

samingo said:
(...)
Do you have any suggestions or do you really think hardware failures are occurring? With the motherboard of the S21 Ultra, costs almost as much as a new one?
Click to expand...
Click to collapse
There can be many causes and locations of damage.
Without physical access to the phone and knowledge of operation and diagnostics, it is impossible to know if repair is possible and what the cost will be.
Samsung Galaxy S21 Ultra Teardown
What’s better than a Max? Depends who you ask,...
www.ifixit.com

So can I do nothing more from here?
You just have to be careful, as already explained on the website (Teardown), the back cover is difficult to solve. And do you also have to expand a chip? A question on the side? Can you just expand the memory chip? From 128GB to 256GB? Or even higher? Only purely out of interest.