Carrier Aggregation ( 4g+/ Lte+) - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

Hey guys,
Anyone tried flashing xiaomi EEA rom or EEA modem on other devices ( raphaelin, raphael, etc), as the EEA rom supports more of the bands required for carrier aggregation (CA) ?, we will definitely see a bump in network speeds, as the current ones aren't upto the mark, xiaomi cheaped out on CA, not buying licenses from Qualcomm. So i guess, this is worth a shot, I understand that EEA isn't updated as frequently, but still?
Thanks

The ROM has nothing to do with what bands are supported. Flashing a different ROM will not enable or disable any bands

Bands are dependant on the modem which is only editable through a specific qualcomm tool
As far as I know still 855 SoC is not supported in this tool
It is not a file you can flash through fastboot or recovery

lordkiller347 said:
The ROM has nothing to do with what bands are supported. Flashing a different ROM will not enable or disable any bands
Click to expand...
Click to collapse
shouk_1987 said:
Bands are dependant on the modem which is only editable through a specific qualcomm tool
As far as I know still 855 SoC is not supported in this tool
It is not a file you can flash through fastboot or recovery
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Click to collapse
Not bands guys, i was talking about ca, which we can enable via tool "Qxdm", but as said above, it doesn't support sd855 yet . Maybe flashing EEA modem will get us carrier aggregation? ?

Am NoobMaster69 said:
Not bands guys, i was talking about ca, which we can enable via tool "Qxdm", but as said above, it doesn't support sd855 yet . Maybe flashing EEA modem will get us carrier aggregation? ?
Click to expand...
Click to collapse
This is the same tool that had been used to enable bands. It does it by modifying the nvram but the modem on the K20 Pro is locked so the nvram cannot be modified. There is already a similar tool that supports the SD855 but it doesn't work on the K20 Pro because of its locked modem

Related

Band 17 support?

So I was about to buy the phone but wanted to verify LTE bands first. The seller lists B17 support, but the Mi9 web page at Xiaomi's site does NOT list band 17 support. I find this strange, since the Mi8 does support B17 and the Mi Mix 3S supports B17. So Is there any real confirmation on whether the Mi 9 does or does not support this LTE band? Is the lack of it being listed at Xiaomi site just a type?
4G LTE FDD:B1/B2/B3/B4/B5/B7/B8/B12/B17
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Click to collapse
4G: FDD LTE B3:1800/B1:2100/B7:2600/B5:850/B8:900/B2/B4:1700/B12/B17
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Click to collapse
https://www.aliexpress.com/item/Xia...agon-855-Octa-Core-6-39-48MP/32974093932.html
https://www.aliexpress.com/item/Xia...9-Snapdragon-855-Octa-Core-6/32976448415.html
and yet:
https://www.mi.com/global/mi9/specs/
4G:LTE FDD: B1/2/3/4/5/7/8/12/20/28
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Click to collapse
EDIT: ok, so the internation page and version of the phone does not mention B17 support. However the Chinese page DOES list B17 support on their model:
https://www.mi.com/mi9/specs/
4G:LTE FDD:B1/B2/B3/B4/B5/B7/B8/B12/B17
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Click to collapse
So does that mean only Chinese versions support this and I must buy Chinese version and run Chinese ROM to get band 17 support to work with ATT? I would rather flash to Global ROM, but I am thinking that Global kernel or other firmware may remove B17 support? Can the Global ROM be run on China firmware? They do say China ROM support English....
EniGmA1987 said:
So does that mean only Chinese versions support this and I must buy Chinese version and run Chinese ROM to get band 17 support to work with ATT? I would rather flash to Global ROM, but I am thinking that Global kernel or other firmware may remove B17 support? Can the Global ROM be run on China firmware? They do say China ROM support English....
Click to expand...
Click to collapse
I'd definitely trust Xiaomi's official site more than anywhere else, if you check Xiaomi's official site for Spain (which sells the Global variant) it doesn't list band 17..
Flashing Global on a Chinese device or vice versa doesn't affect the bands as far as I'm aware, there's evidence of Xiaomi hardware locking the bands on the Pocophone, forum links below:
https://forum.xda-developers.com/poco-f1/help/poco-f1-lte-bands-unlock-t3835467
https://forum.xda-developers.com/poco-f1/how-to/pocophone-lte-band-unlock-report-t3848193
If you buy a Chinese Mi 9 then you should be able to flash the Global ROM, same as all previous Xiaomi's, however you have to keep the bootloader unlocked once flashed, trying to relock will result in a brick
These steps were for a MI Note, but may work with the MI 9:
https://forum.xda-developers.com/redmi-note/general/unlock-lte-bands-step-step-xiaomi-mi-t3084774
TheInfiniteAndroid said:
I'd definitely trust Xiaomi's official site more than anywhere else, if you check Xiaomi's official site for Spain (which sells the Global variant) it doesn't list band 17..
Flashing Global on a Chinese device or vice versa doesn't affect the bands as far as I'm aware, there's evidence of Xiaomi hardware locking the bands on the Pocophone, forum links below:
https://forum.xda-developers.com/poco-f1/help/poco-f1-lte-bands-unlock-t3835467
https://forum.xda-developers.com/poco-f1/how-to/pocophone-lte-band-unlock-report-t3848193
If you buy a Chinese Mi 9 then you should be able to flash the Global ROM, same as all previous Xiaomi's, however you have to keep the bootloader unlocked once flashed, trying to relock will result in a brick
Click to expand...
Click to collapse
TheInfiniteAndroid said:
I'd definitely trust Xiaomi's official site more than anywhere else, if you check Xiaomi's official site for Spain (which sells the Global variant) it doesn't list band 17..
Flashing Global on a Chinese device or vice versa doesn't affect the bands as far as I'm aware, there's evidence of Xiaomi hardware locking the bands on the Pocophone, forum links below:
https://forum.xda-developers.com/poco-f1/help/poco-f1-lte-bands-unlock-t3835467
https://forum.xda-developers.com/poco-f1/how-to/pocophone-lte-band-unlock-report-t3848193
If you buy a Chinese Mi 9 then you should be able to flash the Global ROM, same as all previous Xiaomi's, however you have to keep the bootloader unlocked once flashed, trying to relock will result in a brick
Click to expand...
Click to collapse
Thanks for the reply. I ended up buying the chinese version phone just now since that is the one Xiaomi says supports the bands I need. I will work on it when I get the phone in and verify whether I can unlock and install global ROM and still have the bands :good:
Thank you for your help
EniGmA1987 said:
Thanks for the reply. I ended up buying the chinese version phone just now since that is the one Xiaomi says supports the bands I need. I will work on it when I get the phone in and verify whether I can unlock and install global ROM and still have the bands :good:
Thank you for your help
Click to expand...
Click to collapse
Be sure to report back man, good luck, & glad I could help!
EniGmA1987 said:
Thanks for the reply. I ended up buying the chinese version phone just now since that is the one Xiaomi says supports the bands I need. I will work on it when I get the phone in and verify whether I can unlock and install global ROM and still have the bands :good:
Thank you for your help
Click to expand...
Click to collapse
I also ordered the Chinese version because it has 4 LTE bands for T-Mobile
Amy news guys about thé bands on the chinese version ans installing thé global rom ?
kira-senpai said:
Amy news guys about thé bands on the chinese version ans installing thé global rom ?
Click to expand...
Click to collapse
The Chinese version has the proper USA LTE Bands. It doesn't have band 20 for Europe
jvs60 said:
The Chinese version has the proper USA LTE Bands. It doesn't have band 20 for Europe
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Click to collapse
Where do you buy Chinese version from?
StDevious said:
Where do you buy Chinese version from?
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TradingShenzhen, AliExpress, Banggod.
Myself and a few others have had very good service through TradingShenzhen.
Is there a global version ith 8Gb of RAM ?
kira-senpai said:
Is there a global version ith 8Gb of RAM ?
Click to expand...
Click to collapse
No
I'm seeing some contrary information out there about what phone has what bands. Is there a code I can enter in dialer to see all available bands on my device? All I see is that I'm currently connected with B2 in *#*#4636#*#* and various apps I've picked up. I'm wanting to see exactly what's available in the device in my hand rather than specs on 4 different websites(with different values). The primary website I'm looking at is showing me I made a mistake with getting the 8/256 transparent china rather than the 12/256 but I'd really like to know for sure(especially since I'm currently not experiencing any problems with AT&T). It was easy with my W10M phone(##2382#) but I'm a bit lost with Android.
Unfortunately for me it didn't work. Like I said, 4G + appears on my phone screen, but the apps don't connect and I can't even use the browser because it says I'm not connected. Already tried to fix APN settings, checked if I had LTE on, but nothing worked. The internet only works if I have H+ on the screen. And now I have another problem: I downloaded my original parameters before switching to the modified ones, but now when resetting my original parameters and restarting, the phone remains without a network signal. The IMEI numbers are correct, the settings are ok, but I still have no network signal. Does anyone know how to fix this, or have the original .xqcn file to send me? Thanks.
fafuzito said:
Unfortunately for me it didn't work. Like I said, 4G + appears on my phone screen, but the apps don't connect and I can't even use the browser because it says I'm not connected. Already tried to fix APN settings, checked if I had LTE on, but nothing worked. The internet only works if I have H+ on the screen. And now I have another problem: I downloaded my original parameters before switching to the modified ones, but now when resetting my original parameters and restarting, the phone remains without a network signal. The IMEI numbers are correct, the settings are ok, but I still have no network signal. Does anyone know how to fix this, or have the original .xqcn file to send me? Thanks.
Click to expand...
Click to collapse
are you posting in the wrong thread? there are no instructions in this thread.

T-Mobile Specific Model.. Band Support

According to this link, the T-mobile variant of the S10 only supports the necessary bands used for T-mobile, (B2(1900), B4(AWS), B5(850), B12(700), B66(AWS-3), B71(600MHz))
I know that T-mobile lets you unlock your phone under some conditions, so if I where to unlock it, would I get all the necessary bands used on other US carriers?
EDIT: Here's that link https://www.techwalls.com/samsung-galaxy-s10-model-number-sm-g973-differences/
That's SIM unlock, which is unrelated to activated bands. You'd need to access the service menu to see a list of all bands present. Although, one could flash the firmware of their desired carrier and gain access to features on previous generations.
Previous US models were able to access the required bands if the CSC and firmware were updated to the new carrier (I know from the S7 and S8. I cannot speak for the S10 though.
Ace42 said:
That's SIM unlock, which is unrelated to activated bands. You'd need to access the service menu to see a list of all bands present. Although, one could flash the firmware of their desired carrier and gain access to features on previous generations.
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Click to collapse
Outbreak444 said:
Previous US models were able to access the required bands if the CSC and firmware were updated to the new carrier (I know from the S7 and S8. I cannot speak for the S10 though.
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Click to collapse
Im new to samsung, so do the locked bootloaders still allow to flash samsung signed firmware via odin?
What do you mean by CSC?
Low_Key_Slaps said:
Im new to samsung, so do the locked bootloaders still allow to flash samsung signed firmware via odin?
What do you mean by CSC?
Click to expand...
Click to collapse
Yes, that is correct.
Here is a link to the process for the S8+ just to give you an idea of what it will be like, but keep in mind, these are NOT the instructions you will follow, it's just for reference.
https://forum.xda-developers.com/galaxy-s8+/how-to/snap-guide-flashing-standard-fw-carrier-t3627255
Ace42 said:
That's SIM unlock, which is unrelated to activated bands. You'd need to access the service menu to see a list of all bands present. Although, one could flash the firmware of their desired carrier and gain access to features on previous generations.
Click to expand...
Click to collapse
Outbreak444 said:
Previous US models were able to access the required bands if the CSC and firmware were updated to the new carrier (I know from the S7 and S8. I cannot speak for the S10 though.
Click to expand...
Click to collapse
Outbreak444 said:
Yes, that is correct.
Here is a link to the process for the S8+ just to give you an idea of what it will be like, but keep in mind, these are NOT the instructions you will follow, it's just for reference.
https://forum.xda-developers.com/galaxy-s8+/how-to/snap-guide-flashing-standard-fw-carrier-t3627255
Click to expand...
Click to collapse
I've been thinking about buying a Chinese model, or any unlocked snapdragon model. Since they have the same chipset, do you think I could gain the necessary bands for a US carrier? For example, I dont think they support band 71 out of box. Im wondering if since they probably use the same modem, if it would be easy to somehow unlock those bands through firmware
From the t-mobile website: https://support.t-mobile.com/docs/DOC-39456
4G LTE
2, 4, 5, 12, 66, 71, LTE-U/LAA 46
Roaming Bands
1, 3, 7, 8, 13,18,19,20,25,26,28, 34, 38, 39, 40,41
Low_Key_Slaps said:
I've been thinking about buying a Chinese model, or any unlocked snapdragon model. Since they have the same chipset, do you think I could gain the necessary bands for a US carrier? For example, I dont think they support band 71 out of box. Im wondering if since they probably use the same modem, if it would be easy to somehow unlock those bands through firmware
Click to expand...
Click to collapse
Unfortunately, I am not sure if you can flash the US Snapdragon firmware onto the Chinese model. In theory, it sounds possible.

4G not working in A1

Hi! 4G isnt working on my Mi9 with A1 network but they use the suported frequencies. I tried reseting APN and some other changes in developer options nothing worked. Any idea?
I'm gona try and flash the ROM when I unlock it from CN to global or EEA. which one should I chose if there is any big difference?
urbyx said:
Hi! 4G isnt working on my Mi9 with A1 network but they use the suported frequencies. I tried reseting APN and some other changes in developer options nothing worked. Any idea?
I'm gona try and flash the ROM when I unlock it from CN to global or EEA. which one should I chose if there is any big difference?
Click to expand...
Click to collapse
Which variant do you have? if it's the alita / explorer / transparent edition (8/256GB or 12/256GB) then there's NO BAND 20, which is LTE for many providers. Have you checked this?
EDIT: see here, perhaps you're in an area that doesn't use band 7 and only band 20? If this is the case... No ROM you flash can alter that, it's hardware related. ONLY global devices (64/128GB) support band 20
reg66 said:
Which variant do you have? if it's the alita / explorer / transparent edition (8/256GB or 12/256GB) then there's NO BAND 20, which is LTE for many providers. Have you checked this?
EDIT: perhaps you're in an area that doesn't use band 7 and only band 20? If this is the case... No ROM you flash can alter that, it's hardware related. ONLY global devices (64/128GB) support band 20
Click to expand...
Click to collapse
I have transparet ediotion 8/256gb. Checked there is no band 20 in my area but 4g works everywhere else
Should I still flash the ROM to global or eea? Can I relock it after or is it gona brick..
urbyx said:
I have transparet ediotion 8/256gb. Checked there is no band 20 in my area but 4g works everywhere else
Should I still flash the ROM to global or eea? Can I relock it after or is it gona brick..
Click to expand...
Click to collapse
Do not relock bootloader after flashing rom, it will most likely brick your device. Flash another ROM if you like but you won't get band 20
May I ask, why do you want to relock bootloader after flashing a new ROM?

Will the K20 Pro being sold on Flipkart tomorrow be the chinese model?

I'm very confused.
Flipkart are selling K20 Pros in a flash sale tomorrow. Are these the same as the ones sold on other websites?
I read somewhere that Indian K20 Pros will have a different devie codename and take different ROMs. Some people say they won't have NFC, and others say it's a software limitation.
theOriginalSuperl2 said:
I'm very confused.
Flipkart are selling K20 Pros in a flash sale tomorrow. Are these the same as the ones sold on other websites?
I read somewhere that Indian K20 Pros will have a different devie codename and take different ROMs. Some people say they won't have NFC, and others say it's a software limitation.
Click to expand...
Click to collapse
Any model sold in India via official partners like Mi.com/Flipkart will be the Indian Model codename Raphaelin. NFC is not of much use currently in India and its forced disabled from the software at the time being on 10.3.3.0 Future OTA's might trigger and activate it but no one knows that for sure as there was no mention of NFC during the launch, however users who have unlocked and flashed EU roms have NFC enabled so the hardware is definitely present.
The Chinese variant is not sold here and the code name is Raphael.
You may visit this thread running to mention the existing issues users have reported.
Funk Wizard said:
Any model sold in India via official partners like Mi.com/Flipkart will be the Indian Model codename Raphaelin. NFC is not of much use currently in India and its forced disabled from the software at the time being on 10.3.3.0 Future OTA's might trigger and activate it but no one knows that for sure as there was no mention of NFC during the launch, however users who have unlocked and flashed EU roms have NFC enabled so the hardware is definitely present.
The Chinese variant is not sold here and the code name is Raphael.
You may visit this thread running to mention the existing issues users have reported.
Click to expand...
Click to collapse
Thanks, so just to confirm, I can flash raphael ROMs (and it'll change to Raphael in the build.prop) but I'll loose Widevine L1?
Also, are the radio bands the same?
theOriginalSuperl2 said:
Thanks, so just to confirm, I can flash raphael ROMs (and it'll change to Raphael in the build.prop) but I'll loose Widevine L1?
Click to expand...
Click to collapse
Yes, but you'll need to flash a fastboot ROM with the Mi Flash Tool.
You'll lose Widevine L1 and gain NFC.
theOriginalSuperl2 said:
Also, are the radio bands the same?
Click to expand...
Click to collapse
Not quite, the Chinese model appears to have a couple of extra bands available (comparing specs on the official Indian and Chinese Xiaomi websites).

Conversion from SM-G781B to SM-G7810

Hello,
I wonder if it's possible to convert Thailand variant of S20 FE 5G (SM-G781B) to Hong Kong version (SM-G7810). Both has the same Snapdragon 865 chipset and X55 modem. The reason is that I have to study in Japan for three years and I need LTE B18 during my stay, which is not offered on SM-G781B. I had tried Odin method but it said that Secure Check Fail. I already unlock the bootloader and tried again, but still no luck. What I have to do?
Thanks
KenSoftTH said:
Hello,
I wonder if it's possible to convert Thailand variant of S20 FE 5G (SM-G781B) to Hong Kong version (SM-G7810). Both has the same Snapdragon 865 chipset and X55 modem. The reason is that I have to study in Japan for three years and I need LTE B18 during my stay, which is not offered on SM-G781B. I had tried Odin method but it said that Secure Check Fail. I already unlock the bootloader and tried again, but still no luck. What I have to do?
Thanks
Click to expand...
Click to collapse
Somewhere else I read you need patched Odin, so it does not check FW variants.
LGaljo said:
Somewhere else I read you need patched Odin, so it does not check FW variants.
Click to expand...
Click to collapse
I'm sorry, but what does "patched Odin" mean? Is it a particular version? Do you know where I can download it? I have version 3.14. Thanks.
fz75 said:
I'm sorry, but what does "patched Odin" mean? Is it a particular version? Do you know where I can download it? I have version 3.14. Thanks.
Click to expand...
Click to collapse
Something like this:
Patched Odin 3.13.1
For those looking for a modified, modded, or patched odin that is a newer build than all the fake and renamed prince comsy 3.12.3 versions floating around. I patch recent Odin versions to offer similar functionality to the princecomsy; in that...
forum.xda-developers.com
I did not test this mod. Use it at your own risk.
KenSoftTH said:
Hello,
I wonder if it's possible to convert Thailand variant of S20 FE 5G (SM-G781B) to Hong Kong version (SM-G7810). Both has the same Snapdragon 865 chipset and X55 modem. The reason is that I have to study in Japan for three years and I need LTE B18 during my stay, which is not offered on SM-G781B. I had tried Odin method but it said that Secure Check Fail. I already unlock the bootloader and tried again, but still no luck. What I have to do?
Thanks
Click to expand...
Click to collapse
Hello friend. Did you find any solution?

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