Develop Bugs

[Help] Upgrading AT&T i747m from CWM/4.4.4 KitKat to TWRP/CM12.1

Hello guys,
It's been a while since the last time I visited the SGS3 section, over a year ago I remember updating the bootloader in order to upgrade/flash to 4.4.4 which went very smooth and was a success. I gave the phone to a sibling who has been very happy with it for the last year and a half. Lately, the phone has been very unstable with the 4.4.4 KitKat ROM, WiFi doesn't turn on, Bluetooth is unstable, Unstable apps/Force closes. I tried a wipe/factory restore and re-flashed the ROM but the problems persisted.
I did a little research and liked what CyanogenMod is doing and since they are actively supporting the phone I decided to flash CM12.1 and the provided Open Google-Apps, CM12.1 flashed successfully but Open Google-apps refused to install, CWM displayed (Section 6) error which upon research it is common with CWM and the solution is to flash TWRP. I booted with CM12.1 in order to install TWRP Manager through the APK and flash TWRP but it force-closed when it searched for the device model. WiFi was working but Bluetooth was still unstable.
I would like to know what would be the best way to proceed in this case, I would like to upgrade the recovery to TWRP and flash CM12.1 or any other stable Lollipop ROM.
Thanks,
Oscar

absolute all credit to @audit13.
http://forum.xda-developers.com/showthread.php?t=3313734
perhaps this will help.
"err on the side of kindness"

Flashing ROM bricks phone?!

I'm currently running my OP3 on Resurrection Remix 5.7.4 (MM 6.01), the phone has the latest version of TWRP and I've flashed other ROMs in the past without any issue
RR has proven to be quite unstable for me, the system UI keeps crashing, which renders the phone unusable until after a reboot so I wanted to flash Freedom OS as that worked quite well for me previously. When I tried to flash the ROM in TWRP the ROM seemed to flash successfully but when I rebooted, only the boot logo showed and then the screen went black and the phone refused to respond at all for about two hours, after that exactly the same thing happened. I managed to boot into recovery and tried flashing a different ROM but the result was the same every time, the only way to get the phone to work normally was to flash RR again/restore from a Nandroid backup, either way, the result is the same, I'm stuck on an unstable ROM and I don't know why, the last time I flashed these ROMs they worked fine, I followed all of the instructions for flashing said ROMs to the letter, I have the latest version of TWRP, etc, does anyone know what the problem could be?

Have you flashed the latest firmware? If not, I think this is why due to you being on a very old version (6.0.1) and as you are not flashing official OxygenOS you are not getting the newest firmware.
Download and flash the latest firmware here:
https://forum.xda-developers.com/oneplus-3/how-to/radio-modem-collection-flashable-zips-t3468628
Pick the right one for the ROM you are flashing (For Freedom OS installing firmware Open Beta 14 - Firmware + Modem under 7.1.1 should be good.)
Note: After you have flashed the firmware the next time you reboot the phone it will appear to not turn on for a few seconds, this is normal while it updates, don't worry
Let me know if you have any questions

Oneplus 5t issues with hard reset

Hey there,
in all my years using/modding android phones I was never this lost on finding the issue.
My Oneplus 5t was unlocked, had latest blue_spark TWRP 3.40 recovery and stock oos 10.0.0 with the blue spark kernel and magisk installed. I just upgraded to the 8t and wanted to revert my phone back to stock. So I made a nandroid backup in TWRP and used the unbrick tool to get the phone in the fastest way possible fully wiped back to stock.
(https://forum.xda-developers.com/oneplus-5t/how-to/oneplus-5t-unbricking-tool-confirmation-t3733012 OOS 5.1.7).
Well after my phone was fully stock I was already kinda suspicious about it not finding any OTA updates and manually installed the latest oos 10.0.1 update. First it seemed like everything was working just fine but then I realised that the camera is not starting anymore and gives me the error "Error starting camera" ("Fehler beim Öffnen der Kamera). Since then I have tried everything possible for 2 days but I still am unable to fix the issue.
Everything I tried.
1. deleting camera app data/cache and phone cache in stock recovery
2.factory resetting the phone
3.Using the latest 9.0.11 unbrick tool from this thread https://forum.xda-developers.com/oneplus-5t/how-to/op5t-collection-unbrick-tools-t3898890
-with this my wifi was not working but the camera was working again
- and this also showed me (while using mobile data) that there is a ota update available (oos 10.0.1)
- after updating my wifi was working and the camera was not working
4.Using at least 7 or 8 different unbrick versions (still from this thread here https://forum.xda-developers.com/oneplus-5t/how-to/op5t-collection-unbrick-tools-t3898890)
- here I noticed that as soon as I had a android version below 9 it would not show me available ota updates and would not even let me manually update but camera and wifi was working
5. unlocking the bootloader, flashing twrp 3.40 and restoring my nandroid backup
- camera is not working
So as you guys can see I am really close on losing my mind with this phone and I would appreciate any help you can give me :fingers-crossed:
// looks like I need to send in my phone to Oneplus
//Oneplus "certified" service in poland was unable (my guess is they did not even bother) to find the issue and quoted a 300€ repair bill for changing the mainboard ^^

Converting back to stock firmware from Custom Os [HELP]

I'm currently on DotOS 5.1.2 currently and want to go back to stock samsung firmware. I have a sm g9600 from mexico i believe. If i try to flash whatever the newest firmware is for mexico would that work? Is there anything special i need to do to prep for the new firmware? DotOS is on android 11 and the highest android version i have found is 10 from samsung. I'm wanting to revert back so i can have bluetooth calling and screen mirroring working properly again, and hopefully less battery drain.

It should be working fine, just flash the newest rom via Odin. After flashing you might get some errors during the first run. In such case you need to go to standard recovery and do a factory reset + wipe cache.

I am also unhappy with the amount of time I have wasted with custom ROMs for this phone. How do I go back?

[Help] Problems flashing any android 10+ roms on my redmi 7 device

Hello XDA people. I'm an enthusiast of flashing and testing android ROMs, but I am kinda rookie using this device.
The problem in question is that I cannot successfully flash any Android 10 and later ROMs on my device, I always face several problems after flashing and booting any ROM, such as the wifi's not working (got the exclamation mark on the icon), audio problems, mobile data increiblely slow, bluetooth and GPS issues, etc etc. I tried to flash official and supported ROMs like lineageos, evolutionx, pyxisos, havoc as well as unofficial roms, but I always get the same problems (the wifi issue is the problem that I want to fix the most)
I tried flashing the original MIUI firmware through recovery and bootloader method, I dirty/clean flashed the roms after and nothing, I also used factory reset, used OrangeFox, TWRP (official and unofficial versions) and I still have the same result. I tried every method I know and it seems I won't have the problem fixed. I don't know if it's that the firmware is not properly flashed, or if I deleted a partition. What can I do?
The device only works using the MIUI original firmare but I don't like it because of the bloatware and the waste of resources. I currently use MMX rom (a modified MIUI rom) in my device right now. It works well but It's currently outdated. I just want to use an AOSP based ROM and having my device updated. Please HELP ME!