Adding custom rom - AT&T Samsung Galaxy S8 Questions & Answers

So I have done this back in the day on my lg g3. I have been trying to install havoc os. Using command prompt I get to the fastboot oem bootloader and keeps getting stuck at waiting for any device. I downloaded Oden 3 but didnt know how to use the havoc download with oden and the google apps.

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fastboot failed (remote, unknown command)

So i tried restoring my axon 7 back to stock and did using edl flash tool. However i am unable to lock the bootloader. I always get the same error command (remote, unknown command) and now i decided to stay with lineage 16 and a schwifty kernal i cannot go back as i now cannot install twrp. Same error commands in fastboot.
The phone is currently on a marshmallow build i think b29. Its a 2017u model..
It says secure boot enabled on fastboot. Is this the route of my problems with trying to lock the bootloader and now flashing twrp???
I bought the phone used last year in Toronto with Nfounds twrp already installed so i just moved things along using the twrp img installer and ran lineage 16.0.
Any help appreciated either locking this bootloader or tbh now getting twrp 3.2.3-0 back on it so i can for the time run LOS16 and schwifty.
cheers
Jcth1 said:
So i tried restoring my axon 7 back to stock and did using edl flash tool. However i am unable to lock the bootloader. I always get the same error command (remote, unknown command) and now i decided to stay with lineage 16 and a schwifty kernal i cannot go back as i now cannot install twrp. Same error commands in fastboot.
The phone is currently on a marshmallow build i think b29. Its a 2017u model..
It says secure boot enabled on fastboot. Is this the route of my problems with trying to lock the bootloader and now flashing twrp???
I bought the phone used last year in Toronto with Nfounds twrp already installed so i just moved things along using the twrp img installer and ran lineage 16.0.
Any help appreciated either locking this bootloader or tbh now getting twrp 3.2.3-0 back on it so i can for the time run LOS16 and schwifty.
cheers
Click to expand...
Click to collapse
If you lock the bootloader while running anything other than stock ROM and recovery you'll brick the phone. Try using a B19 EDL package to return to stock B19, where there's fastboot. Then enter fastboot, and use the command
fastboot oem lock
and it should lock.
I did run the fastboot command and it was always coming up with the remote, unknown command error.
Doesn't matter now as I decided I'll keep the phone so used one of the toolkits to unlock the bootloader and fastbooted twrp 3.2.3-0 to it and reverted back to Los 16.
My issues mainly was when I put it back to stock I still had the device not encrypting screen upon reboot whereby I could choose to not let it boot within 5 seconds and scroll into recovery or bootloader.

Revert to stock android

Hi
I've been trying to go back to stock android using this post. I downloaded both the stock image and recovery.img, but I was stuck in a bootloop, constantly booting into TWRP. I tried one of two different images until H87020A finally worked. I flashed it using LG's download mode and LGUIP/Uppercut. I setup my phone etc, and then flashed H87020G using LGUIP/Uppercut. Now I'm on a working version V20G.
The only thing that doesn't work is recovery. I first tried the stock recovery that comes with the KDZs, but it keeps saying "No command" when I boot into recovery. Then I flashed latest TWRP (3.2.3) using fastboot and it showed succesful, but when booting into it I keep getting the "no command" error.
So now I have a few questions:
1. How can I get TWRP working on it? Should I keep flashing with fastboot until it works?
2. How can I extract a stock recovery imgage from the 20g KDZ I flashed? I tried using this extractor tool to get the DZ and finally the recvery.img, but there is no recovery.img. It consists only of recovery_10246.bin and recoverybak_20614.bin (and of course a bunch of other files, but none of them are called recovery)? I want to use the closest stock recovery.img to the KDZ I'm using so that there are no issues. I found one from V20B from Westworld24, but I'm not sure if that works fine with my version of Android.
3. Assuming I get TWRP to install, then flash the stock recovery using TWRP, can I then simply run "fastboot oem lock" in fastboot or do I need to do something else? Is it essential to flash a clean ROM first or can I just do it over the KDZ I flashed?
The reason I want to do this is because I wanna sell it on rebuy.com and I'm not sure whether they're fine with an unlocked phone. Also, when starting the LastPass app for the first time it says that it seems that my phone is rooted, so basically I'm not on a fully stock phone, which I want to be on when selling it.
Thanks in advance.

adb comands work for fastboot and recovery but not download

Hi,
running a tmo V20 H91820h android v8.0. Ive been working on getting to root, through several methods, The hardware command for download mode stopped working, adb commands still reboot it into recovery, and fastboot.
i've tried the lglaf though SALT and on its own. my newest plan was to flash the OREO plus root from here, https://forum.xda-developers.com/v20/development/rom-h91820f-oreo-root-t3848854, but i'd have to get it into dowload first. the only thing that changed between getting into download and not, was i poped the battery a few times to avoid reboot time while trying to get it into download mode. Otherwise phone boots fine.
what's next???

i got stuck in fastboot mode without any OS installed

So i got an upgrade to an iPhone and i left my old Oneplus 6t for a couple of days, i wanted to update the device to android 10, so i unlocked the bootloader and installed root just to test a couple of things, i was going to install the OS and i just wiped all of the system and everything (i did a backup before doing it) and when i did i couldn't install the other OS, i tried to restore the backup but for some reason it shows that there are files but not the OS and i tried to boot up the phone to see if it works but i got stuck on fastboot mode without any recovery and OS, is there any possible way to install an OS or something because since it was on fastboot i tried to also install again TWRP but it failed, thanks!
Anthony_gi said:
So i got an upgrade to an iPhone and i left my old Oneplus 6t for a couple of days, i wanted to update the device to android 10, so i unlocked the bootloader and installed root just to test a couple of things, i was going to install the OS and i just wiped all of the system and everything (i did a backup before doing it) and when i did i couldn't install the other OS, i tried to restore the backup but for some reason it shows that there are files but not the OS and i tried to boot up the phone to see if it works but i got stuck on fastboot mode without any recovery and OS, is there any possible way to install an OS or something because since it was on fastboot i tried to also install again TWRP but it failed, thanks!
Click to expand...
Click to collapse
You just need to flash a ROM via fastboot method: [ROM][STOCK][FASTBOOT][OP6T] Stock Fastboot ROMs for OnePlus 6T

Unable to install TWRP recovery on Zenfone Max Pro M1

Hi all,
I have this X00TD model, and I recently updated firmware to WW-16.2017.2002.061. The phone has Android recovery, and I want to install Lineage OS. Whenever I try to install Lineage, I get the error 21 "signature verification failed". I read somewhere that I can disable the signature check in TWRP. But TWRP fails to install, whatever I try. I tried 3 different unofficial versions of TWRP (as my phone model has no official version of TWRP) and in fastboot, when I give the command "sudo fastboot flash recovery <filename>.img", nothing happens, and the process just freezes, and I need to kill the terminal to end the process. I have Ubuntu 18.04 installed. ADB and fastboot seem ok. When I type "sudo fastboot devices", my phone entry comes up. Any help would be welcome. I don't have windows os.
Thanks.
akhil520c said:
Hi all,
I have this X00TD model, and I recently updated firmware to WW-16.2017.2002.061. The phone has Android recovery, and I want to install Lineage OS. Whenever I try to install Lineage, I get the error 21 "signature verification failed". I read somewhere that I can disable the signature check in TWRP. But TWRP fails to install, whatever I try. I tried 3 different unofficial versions of TWRP (as my phone model has no official version of TWRP) and in fastboot, when I give the command "sudo fastboot flash recovery <filename>.img", nothing happens, and the process just freezes, and I need to kill the terminal to end the process. I have Ubuntu 18.04 installed. ADB and fastboot seem ok. When I type "sudo fastboot devices", my phone entry comes up. Any help would be welcome. I don't have windows os.
Thanks.
Click to expand...
Click to collapse
Fastboot flash recovery twrp.img
Sent from my ZenFone Max Pro M1 using Tapatalk
If you can't install TWRP on pie, try reverting to Oreo with AFT and then flash TWRP in fastboot. Also make sure you have unlocked the bootloader whether by the official tool or the unofficial method. THIS WILL DELETE ALL DATA SO BACK UP.
Thanks arko. Is there Asus Flash Tool available for Linux also? Will try and revert. Thanks :svetius
Tried reverting to Oreo with AFT, doesn't work. I installed windows 10, but fastboot doesn't work.
#fastboot devices gives me no output. I have the Oreo zip file, any alternate way I can install it? As you mentioned, there seems to be an issue with the pie ROM on my phone. Any way I can downgrade to Oreo using windows/Linux?
akhil520c said:
Tried reverting to Oreo with AFT, doesn't work. I installed windows 10, but fastboot doesn't work.
#fastboot devices gives me no output. I have the Oreo zip file, any alternate way I can install it? As you mentioned, there seems to be an issue with the pie ROM on my phone. Any way I can downgrade to Oreo using windows/Linux?
Click to expand...
Click to collapse
Windows 10 ? Its bcuz Driver Signature Enforcement
Disable it and reinstall adb and fastboot drivers, it will work for sure.
Windows driver security wouldn't accept drivers without proper Signatures,so like i said, just disable it and you are good to go.
:good:
​
Tried steps you mentioned, doesn't work. In fastboot mode, #fastboot devices gives me no output. Looks like my pie ROM is buggy. Basically, I need to install lineage on the phone.
Hi all,
Finally got everything done in about 5 mins I booted up Ubuntu Mate (32 bit) on my other laptop, and found I'd already installed adb and fastboot on it from the repositories (not from google). I booted my phone in fastboot mode, and tried the #fastboot devices command, and voila, my phone got detected! After that, it was a matter of a few minutes, following the installation instructions (of twrp and lineage) from the lineage website. Thanks for all your inputs and help
P.S: I realised (again), after more than 2 decades, that windoze mighty sucks lol.

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