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Question ordering an s21 ultra from tmobile today. questions on bl unlock and root

it will be a day or two after we place the order in a few hours from now. (thursday june 17th 2021).
01 do i need to flash the newer U1 firmware with the v2 bootloader first then do bl unlock and root for custom roms?
02 since we will be in a 2 year contract maybe i should just keep tmobile original firmware and just bl unlock and root that firmware?
03 what is the best way to do it since i know we will be with tmobile for 2 more years?
04 samsung pay wont work and what else?
05 knox will be tripped forever?

en11gma said:
it will be a day or two after we place the order in a few hours from now. (thursday june 17th 2021).
01 do i need to flash the newer U1 firmware with the v2 bootloader first then do bl unlock and root for custom roms?
02 since we will be in a 2 year contract maybe i should just keep tmobile original firmware and just bl unlock and root that firmware?
03 what is the best way to do it since i know we will be with tmobile for 2 more years?
04 samsung pay wont work and what else?
05 knox will be tripped forever?
Click to expand...
Click to collapse
I'm not sure about your local network provider policies so can't say about points 1 to 3. Points no 4 and 5 however are quite simple to answer:
04 samsung pay wont work and what else? Most banking apps, payment gateway apps, some streaming services and a large number of services requiring some kind of authentication or DRM will stop working if they detect that your phone is rooted. Most of these can be bypassed even when rooted using Magisk hide. But Magisk development in the future is uncertain right now, so don't put all your eggs in that basket. Some of these apps may work now, but lose functionality later, unless you unroot.
Samsung Pay is gone forever once you root. As well as Samsung Pass. No way to get these back again as far as I know.
You also won't get OTA updates anymore and will have to flash newer firmwares manually.
Warranty is gone too, unless your country has special laws against this. Recently a forum member posted his experience where Samsung wouldn't even perform a paid repair for a screen replacement. Their reason was apparently because he had rooted his phone and voided his warranty. Think about that - they wouldn't even repair his phone, or sell him the parts, even if he was willing to pay! I'm not going to get into whether that's justified - but it is what it is. Be warned.
If you're willing to take the risk and Samsung Pay etc doesn't mean much to you, and features that rooting bring mean way, wayyyyy more to you, even at the risk of losing warranty, proceed with rooting after careful consideration.
05 knox will be tripped forever? Yes. Once you root, this will be irreversibly, permanently, irrevocably, unrecoverably, soul-stone permanently - be tripped forever. Nothing short of a motherboard replacement will get that flag up again.

is there a proper way about doing it when we receive the phones?
i mean will the phones try and auto update when i insert the sim card and power phone on therefore stopping the phone from being bl unlocked and rooter on stock firmware?
do i need to stop this from happening?

en11gma said:
is there a proper way about doing it when we receive the phones?
i mean will the phones try and auto update when i insert the sim card and power phone on therefore stopping the phone from being bl unlocked and rooter on stock firmware?
do i need to stop this from happening?
Click to expand...
Click to collapse
There's a paid service for unlocking bootloaders on certain US Snapdragon devices. If you update to the March Security Patch or later the bootloader can't be unlocked. You can turn off the Auto Update function. There are a number of features you'll lose. Warranty (Knox will be tripped), Samsung Pay and Pass. You will also lose Secure Folder and Samsung Health however they may be able to get restored. All data is lost as well as any option to update the device and expect the bootloader to remain unlocked. You can review the details here.
[Android][UNSAMLOCK] Bootloader Unlock for Samsung US/Canada Devices
This thread is @svetius approved Important notice: Do not update to April 2023 security update (XXXXXXXXXXWCX) or later. Examples: G998USQS6EWCA, N986USQU4HWD1. Samsung has patched the bootloader unlock again on those updates. NOTE: The OneUI...
forum.xda-developers.com

if this is T-Mobile US (or any US snapdragon version including unlocked, network free) you'll only be able to unlock your bootloader via the above mentioned type of method which isn't cheap as I understand it.

Personally I would need to see a custom rom with a whole lot of functionalities I would use before I opted for this method. If rooting your device is a priority it would seem to make more sense to aquire a Snapdragon or Exynos variant with an unlocked bootloader. The reason for buying a US Branded device, besides a generous trade in allowance are carrier features. If you root a carrier device you'll lose a number of these advantages.

varcor said:
Personally I would need to see a custom rom with a whole lot of functionalities I would use before I opted for this method. If rooting your device is a priority it would seem to make more sense to aquire a Snapdragon or Exynos variant with an unlocked bootloader. The reason for buying a US Branded device, besides a generous trade in allowance are carrier features. If you root a carrier device you'll lose a number of these advantages.
Click to expand...
Click to collapse
i thought if i bl unlock and root a stock firmware it just allows me to use twrp to make full backups so i can restore later and the root is for like hotspot stuff.
i know root disable samsung pay and something else but i thought all the carrier stuff still worked correctly

en11gma said:
i thought if i bl unlock and root a stock firmware it just allows me to use twrp to make full backups so i can restore later and the root is for like hotspot stuff.
i know root disable samsung pay and something else but i thought all the carrier stuff still worked correctly
Click to expand...
Click to collapse
You should inquire about call features with the developer before you decide. IMHO you're sacrificing a lot of features for a hotspot.

Check list if I want to buy a S10 with the intention of rooting

I am looking for a phone to replace my rooted S5. One of the candidate is a second hand S10.
It is crucial that I am able to root the phone, and I was wondering how tricky the process is on this phone, and whether there are models where it might be impossible (perhaps Snapdragon based?), or if the baseband is above a certain version, or anything there are anything else that might impede the process I should pay attention to.
If anyone has successfully rooted their device in 2021 (ideally recently), please let me know.
Thanks.

A few fellow XDAers have done this recently. I assume you're speaking about a Snapdragon phone, which is where it gets tricky. The process requires payment to someone to perform the actual unlock... there are two providers (that I know of) that offer this service.
For the device, the bootloader revision is what's important - it needs to be old enough to allow this to work. In addition, once unlocked, it must REMAIN on this older bootloader otherwise you lose root. I believe you must be on BLv4 or older, which means it cannot be updated past Februrary of this year. The 5th character in the PDA/Phone build number (a number) from the right is what shows this version. For example, the March update for Verizon on the SM-G975U is G975USQU5GUBH, so that "5" means it's BL5.
My recent purchased phones were 5 and 6. I'm giving up on getting root, as I don't need it anymore. Sure, I'd prefer to have it, but it's getting too difficult and expensive to get it and I don't NEED it...
The two unlock providers I know about can be seen here (I have used neither myself, of course):
[Android][UNSAMLOCK] Bootloader Unlock for Samsung US/Canada Devices
This thread is @svetius approved Important notice: Do not update to April 2023 security update (XXXXXXXXXXWCX) or later. Examples: G998USQS6EWCA, N986USQU4HWD1. Samsung has patched the bootloader unlock again on those updates. NOTE: The OneUI...
forum.xda-developers.com
Samsung Development | SamPWND
Unlock your bootloader on USA Model Samsung Galaxy devices! Visit https://www.sampwnd.com and have the SamPWND team help you!
www.sampwnd.com

schwinn8 said:
A few fellow XDAers have done this recently. I assume you're speaking about a Snapdragon phone, which is where it gets tricky. The process requires payment to someone to perform the actual unlock... there are two providers (that I know of) that offer this service.
For the device, the bootloader revision is what's important - it needs to be old enough to allow this to work. In addition, once unlocked, it must REMAIN on this older bootloader otherwise you lose root. I believe you must be on BLv4 or older, which means it cannot be updated past Februrary of this year. The 5th character in the PDA/Phone build number (a number) from the right is what shows this version. For example, the March update for Verizon on the SM-G975U is G975USQU5GUBH, so that "5" means it's BL5.
My recent purchased phones were 5 and 6. I'm giving up on getting root, as I don't need it anymore. Sure, I'd prefer to have it, but it's getting too difficult and expensive to get it and I don't NEED it...
The two unlock providers I know about can be seen here (I have used neither myself, of course):
[Android][UNSAMLOCK] Bootloader Unlock for Samsung US/Canada Devices
This thread is @svetius approved Important notice: Do not update to April 2023 security update (XXXXXXXXXXWCX) or later. Examples: G998USQS6EWCA, N986USQU4HWD1. Samsung has patched the bootloader unlock again on those updates. NOTE: The OneUI...
forum.xda-developers.com
Samsung Development | SamPWND
Unlock your bootloader on USA Model Samsung Galaxy devices! Visit https://www.sampwnd.com and have the SamPWND team help you!
www.sampwnd.com
Click to expand...
Click to collapse
Thanks. Does the Bootloader 5 restriction also applies on Exynos devices? I am uessing that might be why I had difficulties my recently purchased Tab S4.
Another question, can a bootloader be updated while the OS stays on an older version, or do they usually get updated together? For instance, if I find a phone that is still on Pie, is it likely be on an older baseband, or can a phone be on Pie AND be on a new baseband?

I don't know much about Exynos systems, but from what I gather they may be "normally rootable"... I don't believe there are as many restrictions on that platform (it seems to be a USA/EU thing to prevent rooting, primarily).
BL and OS seem to get upgraded together, generally speaking.

xAxB said:
Thanks. Does the Bootloader 5 restriction also applies on Exynos devices? I am uessing that might be why I had difficulties my recently purchased Tab S4.
Another question, can a bootloader be updated while the OS stays on an older version, or do they usually get updated together? For instance, if I find a phone that is still on Pie, is it likely be on an older baseband, or can a phone be on Pie AND be on a new baseband?
Click to expand...
Click to collapse
nope- those can be unlocked whenever
they still can't be downgraded though damn...
I have both phones...snapdragon IS slightly better

Question Bootloader Unlock & Rooting help please.

I just got my phone, the Samsung Galaxy S21 Ultra 5G SM-998U How do I Unlock the bootloader, root & install Msgisk, and customize my kernel? I have the Snapdragon version if that helps any.
- Thanks.

[Magisk][US/CAN BL Unlock] Root for Galaxy S21 Series (B/N/0/U/U1/W)
Note: this guide copied from topjohnwu's. Original guide here US/Canada bootloader unlock thread: here Before Installing Magisk Installing Magisk WILL trip KNOX Unlocking bootloader for the first time will do a data wipe. Installation If you...
forum.xda-developers.com

There is a search function. Make sure you understand what tripping Knox does as you cannot undo it. And remember Magisk Hide has been discontinued by the dev so most apps will be able to detect the phone is rooted again.

Why didn't you research this before you aquired your device? It's not likely your phone is eligible as unlocking the BL requires you haven't updated it. Additionally you'll trip knox and lose a number of features, to include ongoing updates. If you wanted a device you could root and desired a Snapdragon variant those are available without paying for that service. So based on all the features you'll forfeit what advantages outweigh this? Those should be substantial to justify all the down sides you'll incur.

Thank you for your reply. What phone would you suggest is best for customizing and closing roms?l

Mrworley831 said:
Thank you for your reply. What phone would you suggest is best for customizing and closing roms?l
Click to expand...
Click to collapse
OnePlus seems to be the concensus choice.
Redirect Notice
If you want an S21 the Global Exynos variant has an Unlocked BL plus the best selection for Custom ROM's. The SM-G9980 Snapdragon variant has an Unlocked BL as well. If you chose the S21 all the issues I mentioned are still in play, the only difference is you don't have to pay to unlock it.

Newbie question - unlocking / rooting the S20 FE

Hello all,
I have a newbie question - please be patient and point me in the right direction. (And yes I did use Google first).
The question is about rooting the (Canadian) S20 FE 5G.
I understand there are different ways to root - and all require unlocking.
For unlocking there are two sets of instructions
- one instruction says I go into developer settings, select unlock and all is good
- the other instructions advise that one has to pay to have this unlocked (to some guy on Telegram) and the price is pretty expensive.
So which one is it?
I am considering the S20 FE and rooting would be one of the first things -so I would like to know if that comes at an extra cost or not.
Thank you for any pointers!

if you have a Canadian FE and it's firmware is earlier than March (as I understand things) you can ONLY pay via the man on telegram to get it unlocked. if your firmware is after March even that might not work for you.
all Qualcomm phones sold in the US and Canada can't be unlocked via simply toggling OEM unlocking in developer options.

As 3mel said "... all Qualcomm phones sold in the US and Canada can't be unlocked via simply toggling OEM unlocking in developer options"
too many folks just don't get that !!!
As far as paying > some person online- True But ... at this time, there are a few that say they do the S20 FE 5G cheap too. Either via Email or Their App.
All I Do Know, is IF you do this, You will not get any OEM updates, (Seeing how they (samsung) that the S20 FE 5G will see 3 major updates at least, came with 10, we are on 11, and so 12 is coming)
Yes, I see you may not wat to have read that, but, with the Carrier unlocked, and Root, am sure in a short time, we can see many different roms for these Newer Phones...

if you remove root and any custom recovery (usually by just flashing stock over everything) you will start receive OTA updates again.
that's even if the bootloader is still unlocked!!
I doubted this at first but it worked for me. plus updating and reapplying root isn't that hard once you've got a decent idea about what each step is doing and why it needs to be done.

Rooting and custom firmware related query- S20 FE 5G

I have been using Oneplus phones for past 6 years and now got a new S20 FE 5G model (SM-G781B/DS). I have few doubts before I proceed with unlock, flash TWRP and custom roms.
The steps for unlocking and flashing custom rom seems bit complex in samsung than oneplus.
My doubts are:
1. Is my understanding that Samsung warranty gets void (unlike oneplus or xiomi) ,once we unlock bootloader correct?
2. The phone came preloaded with Android 11 based stock rom. I have not done the latest Android 12 based update yet. Will it be more difficult to unlock, if I upgrade to android 12 based stock? Should I stay with Android 11, unlock and later update?
As of now my idea is to stay with official updates till warranty and do flashing after 1 year. Just want to check, if it will get more difficult to unlock, if I go to Android 12.
S20 FE 5G model (SM-G781B/DS)
Current baseband - G781BXXU4CUH5

1) it's not unlocking that voids the warranty but what usually follows that, flashing non official images onto the device. in the EU you still might have a warranty covering hardware defects as the EU demanded the 2 be separated (software warranty and hardware warranty).
2) android 12 changes a few things in that you need the latest version of magisk now and a later version of files to keep a custom recovery in place. the overall principle remains the same between 11 and 12 though.
unlocking will be the same regardless, it's not an exploit it's a feature.

If you root it as well, Samsung Pay wont work and some other Samsung features.
You will void warranty