[RECOVERY][UNOFFICIAL] TWRP for Galaxy S20 Series (Snapdragon)

[josephgrab]

I did not know the SM-G9810 was Snapdragon. I thought it was Exynos. I did get root, so the bootloader can be unlocked. I trust there is no TWRP for that. Now I will try

twrp-3.4.0-1_afaneh92-x1q.tar​

Thank you for your help!

 

[josephgrab]

I was finally able to get this done on SM-G9810. I thought it was Exynos and was using x1s twrp, now I am using x1q. However, the system_root folder is read only. I have root with Magisk and set it to allow root for apps and adb. When I am in adb shell, whoami returns root. However, I cannot overwrite /system_root/system/framework/services.jar with a modified one to allow signature spoofing for microg. I could not use twrp-3.4, I had to use twrp-3.6.0_11-4_afaneh92-x1q.tar.

I have tried file manager in twrp, it says error. Terminal says resource is busy. adb on windows computer says file system is read only. I am trying to remount, but that is not working.

 

[josephgrab]

I did this process on S10 and S10e (both Exynos). I had no trouble overwriting the system_root folder. What keeps this folder as read-only? Is it the vbmeta (I don't know what that does), or do I need to write some modified fstab (I don't even know what that means)? How would I go about doing this? I am not a developer, I don't know the computer languages, but I am fairly good at following instructions.

 

[afaneh92]

I did this process on S10 and S10e (both Exynos). I had no trouble overwriting the system_root folder. What keeps this folder as read-only? Is it the vbmeta (I don't know what that does), or do I need to write some modified fstab (I don't even know what that means)? How would I go about doing this? I am not a developer, I don't know the computer languages, but I am fairly good at following instructions.

# mount r/w in twrp
adb shell mount /dev/block/mapper/system /system_root
adb shell mount /dev/block/mapper/vendor /vendor
# mount r/w in  twrp terminal
mount -o remount,rw /vendor
mount -o remount,rw /system_root
# mount r/w in booted system
adb shell su -c mount -o remount,rw /vendor
adb shell su -c mount -o remount,rw /

 

[josephgrab]

Thank you so much for your help. I am rooted with magisk. I do not have superuser installed (is there one?). I cannot find a comma in twrp terminal, so I typed the twrp terminal commands in adb shell. It looked like this:

C:\Program Files (x86)\Minimal ADB and Fastboot>adb root

C:\Program Files (x86)\Minimal ADB and Fastboot>adb shell mount /dev/block/mapper/system /system_root
mount: /dev/block/mapper/system: need -t

C:\Program Files (x86)\Minimal ADB and Fastboot>adb shell mount /dev/block/mapper/vendor /vendor
mount: /dev/block/mapper/vendor: need -t

C:\Program Files (x86)\Minimal ADB and Fastboot>mount -o remount,rw /vendor
'mount' is not recognized as an internal or external command,
operable program or batch file.

C:\Program Files (x86)\Minimal ADB and Fastboot>adb shell
x1q:/ # whoami
root
x1q:/ # mount -o remount,rw /vendor
x1q:/ # mount -o remount,rw /system_root
x1q:/ # su -c mount -o remount,rw /vendor
/system/bin/sh: su: inaccessible or not found
127|x1q:/ # su -c mount -o remount,rw /
/system/bin/sh: su: inaccessible or not found
127|x1q:/ #

I don't know what the need -t means, and I probably need su. As you can see, I do have root enabled in adb commands in magisk.

 

[josephgrab]

Even though I don't understand this and these errors are present, when I went to file manager in TWRP and moved services.jar from the sd card to system_root/system/framework, it completed! Thank you very much!