Question Looking for a Flash Guide S21 Ultra - Samsung Galaxy S21 Ultra

I just downloaded a new firmware from Sammobile, but I don't remember what to do now.
I have a custom rom flashed right now, as well as Magisk, so I'm not sure if the procedure is different from a new/clean phone.

wbane said:
I just downloaded a new firmware from Sammobile, but I don't remember what to do now.
I have a custom rom flashed right now, as well as Magisk, so I'm not sure if the procedure is different from a new/clean phone.
Click to expand...
Click to collapse
Depends if you want to keep the phone rooted or if you want to return to stock

I wish to keep it rooted, as well as to keep my data (if possible).

wbane said:
I wish to keep it rooted, as well as to keep my data (if possible).
Click to expand...
Click to collapse
Then you need to extract the AP section of the firmware, copy it to your phone. Then open magisk and patch the AP file, then copy the patched file back to your PC. Then you can flash the firmware in Odin using the patched ap, with the bl, and the CSC home file. If you use CSC HOME then your data will be kept.

Great! Could you explain the steps in more details?

Related

MJ5 Build --> NC2 Build?

So I had to reflash my custom rom (UrDroid Deodex) in an attempt to get ISIS / Softcard to work. As I was looking at the roms, I almost downloaded the NC2 version of FireKat before I read not to install it unless coming from Stock NC2. Anyway -- could I flash a NC2 rom?
I used to love UrDroid since it was perfect for me, but ever since I reflashed it, the Home Button isn't working (it works for screenshots, task manager, SVoice, etc. but I can't single click it and expect to be taken to my homepage). I'm interested in trying out FireKat. My OS firmware is 4.4.2
Thanks!
You need to Odin stock NC2, you should be able to find it in the all in one thread. Then root, install ss and then you should be able to flash FK. On FK myself and it's definitely great.
roswelljeeper said:
You need to Odin stock NC2, you should be able to find it in the all in one thread. Then root, install ss and then you should be able to flash FK. On FK myself and it's definitely great.
Click to expand...
Click to collapse
Ahh thanks ... it's been a while since I've done this.
I was looking at the Odin stock NC2 and among the various files to download, I saw this one:
All-in-One N900AUCUCNC2_N900AATTCNC2_N900AUCUCNC2_HOME.tar.md 5
(link to thread: http://forum.xda-developers.com/showthread.php?t=2703006)
I understand the AP, BL, CP, CSC (these are the important ones for Odin), but what's the all in one supposed to be about?
The all in one is to flash with just one file instead of the four.

update to lollipop from twrp/root?

ok i want to upgrade to lollipop stock tmobile and then root.. can i update by TWRP? download the stock lollipop tmo then just flash it? then use CF root to root it?
this is what im on right now..
re: lollipop update
markysd said:
ok i want to upgrade to lollipop stock tmobile and then root.. can i update by TWRP? download the stock lollipop tmo then just flash it? then use CF root to root it?
this is what im on right now..
Click to expand...
Click to collapse
You cannot update to lollipop using twrp.
It has to be done using odin.
If you want to stay 100% stock and rooted then you need
to odin flash twrp and cf-autoroot.
If you want to flash a custom lollipop rom then you will
need to odin flash lollipop official firmware and odin
flash twrp.
All custom roms are pre-rooted so no need to root them.
Good luck!
Misterjunky said:
You cannot update to lollipop using twrp.
It has to be done using odin.
If you want to stay 100% stock and rooted then you need
to odin flash twrp and cf-autoroot.
If you want to flash a custom lollipop rom then you will
need to odin flash lollipop official firmware and odin
flash twrp.
All custom roms are pre-rooted so no need to root them.
Good luck!
Click to expand...
Click to collapse
Thanks.. So can I just straight up update from what I'm on now?
Just put phone in download mode and update via Odin correct?
Will this erase my stuff internal memory? Movies/pictures
Yes you can. You should back up your stuff though because you'll want to do a factory reset or erase data to get the best results with lollipop.
Although, I did all that and I've got my movies and pictures.
Karakoram2 said:
Yes you can. You should back up your stuff though because you'll want to do a factory reset or erase data to get the best results with lollipop.
Although, I did all that and I've got my movies and pictures.
Click to expand...
Click to collapse
OK backed up my data and moved my stuff to my SD card...
So I'm on that 4.4.4 kit Kat custom ROM.. Just put phone in download mode and flash the lollipop tmobil stock ROM ? I'll just root it with CF after .. I want a clean stock ROM that's just rooted for now..
re: updating to lollipop
markysd said:
OK backed up my data and moved my stuff to my SD card...
So I'm on that 4.4.4 kit Kat custom ROM.. Just put phone in download mode and flash the lollipop tmobil stock ROM ? I'll just root it with CF after .. I want a clean stock ROM that's just rooted for now..
Click to expand...
Click to collapse
Be sure you get the proper version of the lollipop N910T tmobile
firmware from a reliable source like http://sammobile.com and
flash it using odin.
Before flashing new firmware it's always best to do a factory reset first.
Back up all your important stuff first.
Good luck!
Misterjunky said:
Be sure you get the proper version of the lollipop N910T tmobile
firmware from a reliable source like http://sammobile.com and
flash it using odin.
Before flashing new firmware it's always best to do a factory reset first.
Back up all your important stuff first.
Good luck!
Click to expand...
Click to collapse
OK thanks.. OK I finally have time to flash. And update... So it's ok and safe to factory rest on my custom ROM im on right now?
factory rest /put phone on download mode and update by Odin on my computer correct?
Sure is a big file to download :silly:
That's totally safe.
I just odin flashed.
I didn't erase data till I flashed my rom.
Admittedly within a minute of going through the process.
Mega's instructions are good. You just stop at 5
odin reads and i get the com light up and reads it but it wont find my lollipop firmware i downloaded on the pda part
re: odin
markysd said:
odin reads and i get the com light up and reads it but it wont find my lollipop firmware i downloaded on the pda part
Click to expand...
Click to collapse
You need to navigate in odin and find the location where you saved the firmware file.
There is a box next to the PDA slot and you need to click it and use it to locate the file.
Good luck!
Misterjunky said:
You need to navigate in odin and find the location where you saved the firmware file.
There is a box next to the PDA slot and you need to click it and use it to locate the file.
Good luck!
Click to expand...
Click to collapse
yes ive done it.. clicked the box and PDA to search my FW but wont see it..i even tried to extract it.. the sammobile FW was taking way too long and found another DL.. its legit FW.. i thought my FW DL was not good so i deleted it and now i was for the download again:silly: taking long... ived updated my kies and the drivers also...
is it safe to update using kies? i tried it and reads my phone and the FW but i chicken out when it said " might not work right if device is rooted" something like that
markysd said:
yes ive done it.. clicked the box and PDA to search my FW but wont see it..i even tried to extract it.. the sammobile FW was taking way too long and found another DL.. its legit FW.. i thought my FW DL was not good so i deleted it and now i was for the download again:silly: taking long... ived updated my kies and the drivers also...
is it safe to update using kies? i tried it and reads my phone and the FW but i chicken out when it said " might not work right if device is rooted" something like that
Click to expand...
Click to collapse
Yes it's perfectly safe and doing it that way you will not loose any data,
passwords or settings.
It also is a lot faster than downloading the firmware file.
I am not sure if rooting makes a difference, when I updated using kies
it worked fine for me, kies did tell me that I have un-official firmware
but it gave me the option to continue which I did without any issues.
With kies it takes less than 1/2 the time for it to complete the download and
install/update the firmware compared to a standard download and flash..
Good luck!
Misterjunky said:
Yes it's perfectly safe and doing it that way you will not loose any data, passwords or settings.
It also is a lot faster than downloading the firmware file.
I am not sure if rooting makes a difference, when I updated using kies
it worked fine for me, kies did tell me that I have un-official firmware
but it gave me the option to continue which I did without any issues.
Good luck!
Click to expand...
Click to collapse
ok thanks will try that.... thanks again..sorry for the new bee FAQ lol.. been a while :silly: just want to make sure..
Give it a try. There are faster ways to download it. Pretty sure we sure we showed you.
You're not going to break the phone.
Just in case we didn't
http://forum.xda-developers.com/showthread.php?t=3098187

Flash just the OF1 modem?

Is there a way to flash just the modem?
I think there is a thread on the developement sub forum that addresses this question
loudaccord said:
Is there a way to flash just the modem?
Click to expand...
Click to collapse
My thread over in Android Development for the released OF1 ROM includes a FLASH_ME package that contains just the modem. Remember, you won't be able to downgrade the modem, but that's not really a big deal. Just keep that in mind when you flash a stock ODIN package for OC3/OE2, that you need to reflash that package immediately right after (won't fully boot, otherwise).
You can flash this with FlashFire, you don't need to use ODIN.
trailblazer101 said:
My thread over in Android Development for the released OF1 ROM includes a FLASH_ME package that contains just the modem. Remember, you won't be able to downgrade the modem, but that's not really a big deal. Just keep that in mind when you flash a stock ODIN package for OC3/OE2, that you need to reflash that package immediately right after (won't fully boot, otherwise).
You can flash this with FlashFire, you don't need to use ODIN.
Click to expand...
Click to collapse
Super appreciated. I wasn't sure if that was the case or not. I like everything the way my phone is now but have terrible reception here in South Carolina so I'm curious if the modem will help. Thanks!

Looking for a guide to unroot/back to stock

So I had a botched situation caused by me when flashing a custom Rom (Rom/instructions is great, I went off the reservation myself) and had a soft brick.
I had decided at that point to just revert back to stock and not play around until things stabilize with Eng more. However, I couldn't.
The last stock referenced topic is with an outdated firmware and being 950U1 rather than just U. Downloading updated firmwares (or even attempting that one blindly) resulted in "Device dismatch".
I was then basically forced to (and successfully) go to SamPWN but that wasn't my initial intention.
Does anyone have an updated guide on how we can go back to stock without EngBoot, and specifically also states which CSC file is needed?
uaktags said:
So I had a botched situation caused by me when flashing a custom Rom (Rom/instructions is great, I went off the reservation myself) and had a soft brick.
I had decided at that point to just revert back to stock and not play around until things stabilize with Eng more. However, I couldn't.
The last stock referenced topic is with an outdated firmware and being 950U1 rather than just U. Downloading updated firmwares (or even attempting that one blindly) resulted in "Device dismatch".
I was then basically forced to (and successfully) go to SamPWN but that wasn't my initial intention.
Does anyone have an updated guide on how we can go back to stock without EngBoot, and specifically also states which CSC file is needed?
Click to expand...
Click to collapse
I may not have the answer, but check these guys and ask questions there, you should get an answer.
https://forum.xda-developers.com/tm.../guide-how-to-convert-to-100-stock-t-t3615957
And this link if from an unlocked S8 forum, but it has some info that you can find useful.
https://forum.xda-developers.com/galaxy-s8/how-to/snap-guide-flashing-standard-fw-carrier-t3625817
Charkatak said:
I may not have the answer, but check these guys and ask questions there, you should get an answer.
https://forum.xda-developers.com/tm.../guide-how-to-convert-to-100-stock-t-t3615957
And this link if from an unlocked S8 forum, but it has some info that you can find useful.
https://forum.xda-developers.com/galaxy-s8/how-to/snap-guide-flashing-standard-fw-carrier-t3625817
Click to expand...
Click to collapse
Download latest firmware for your phone, download Odin. Then flash them.
mweinbach said:
Download latest firmware for your phone, download Odin. Then flash them.
Click to expand...
Click to collapse
As I stated, I've attempted this and it failed. Plus it doesn't explain which file for the CSC had it worked anyhow. Downloading the latest results in the model dismatch. So can't JUST download and flash. But thanks for atleadt trying.
@charkata thanks for the links, I'll check them out and see how that goes.
uaktags said:
As I stated, I've attempted this and it failed. Plus it doesn't explain which file for the CSC had it worked anyhow. Downloading the latest results in the model dismatch. So can't JUST download and flash. But thanks for atleadt trying.
@charkata thanks for the links, I'll check them out and see how that goes.
Click to expand...
Click to collapse
Not the home version. And try using modified Odin.
mweinbach said:
Not the home version. And try using modified Odin.
Click to expand...
Click to collapse
I'll give it a go, going to try to do it in an hour or so and see if it'll work with the PrinceC version.
Is there any chance (in your or anyone elses opinion) that the mismatch could be the result of the custom rom being based on U1 rather than just U?
uaktags said:
I'll give it a go, going to try to do it in an hour or so and see if it'll work with the PrinceC version.
Is there any chance (in your or anyone elses opinion) that the mismatch could be the result of the custom rom being based on U1 rather than just U?
Click to expand...
Click to collapse
No, it can't modify hardware based model number.
uaktags said:
So I had a botched situation caused by me when flashing a custom Rom (Rom/instructions is great, I went off the reservation myself) and had a soft brick.
I had decided at that point to just revert back to stock and not play around until things stabilize with Eng more. However, I couldn't.
The last stock referenced topic is with an outdated firmware and being 950U1 rather than just U. Downloading updated firmwares (or even attempting that one blindly) resulted in "Device dismatch".
I was then basically forced to (and successfully) go to SamPWN but that wasn't my initial intention.
Does anyone have an updated guide on how we can go back to stock without EngBoot, and specifically also states which CSC file is needed?
Click to expand...
Click to collapse
You should be able to just completely reflash the stock TMB firmware with the modded Odin without an issue...am I understanding correctly that this did not work? Download the Prince Comsey modded Odin. It has a .ini file that you need to open w/ a text editor like notepad++, and edit UMS=0 to UMS=1 -this allows you to also flash the userdata file included in the TMB firmware, along w/ the normal BL, AP, CP & CSC.
Make sure you downloaded the correct firmware for the S8 (G950U), not S8+ (G955U).
https://updato.com/firmware-archive-select-model?record=F9F75B5C6CF011E7963AFA163EE8F90B
Did this work? Can anyone confirm? If not, I'm going to try it this weekend and hopefully I'll remember to reply here with results.

Question root s21 ultra ???

i need Every month to root if i want new update????
oraned said:
i need Every month to root if i want new update????
Click to expand...
Click to collapse
No. You root only once. Then you will not get OTA updates. You can flash new updates via ODIN and keep the root.
But a friendly advice: If you're having to ask these kind of questions, I'd recommend going through the forum very carefully and understanding exactly how the rooting, flashing and update process works on Samsung, and what are the irreversible changes you will face once rooted, before trying anything you might regret later.
enigmaamit said:
No. You root only once. Then you will not get OTA updates. You can flash new updates via ODIN and keep the root.
But a friendly advice: If you're having to ask these kind of questions, I'd recommend going through the forum very carefully and understanding exactly how the rooting, flashing and update process works on Samsung, and what are the irreversible changes you will face once rooted, before trying anything you might regret later.
Click to expand...
Click to collapse
Suppose my device is now rooted
And there is a new updates came
How to flash which file via Odin and will it wipe my data also ?
nitinvaid said:
Suppose my device is now rooted
And there is a new updates came
How to flash which file via Odin and will it wipe my data also ?
Click to expand...
Click to collapse
You can flash the new firmware via ODIN. Don't use the CSC file. Use the HOME_CSC file. The CSC will perform a factory reset, but using the HOME_CSC will keep your files and settings intact and only uprgrade the firmware. The AP, BL and CP files are common - you only have to be careful to choose HOME_CSC instead of CSC if you want to preserve your files and settings.

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