Samsung Galaxy A7 Sm-T500
Fleetingcaffeine
tried without success enable wakelock, https://f-droid.org/fr/packages/com.github.muellerma.coffee/ (2.24), https://f-droid.org/fr/packages/com.hifnawy.caffeinate/ (2.1.0) but https://lab.zhs.moe/caffeine/ (2.0.8), from https://moe-zhs-caffeine.en.uptodown.com/android/download worked
root
upgraded the firmware from the tablet, got T500XXS8CXG1 in the build version
power off -> Vol Down+vol up + plug on the computer -> download mode long press vol up vol up
don’t enable the wifi connection (to be able to mess with the date later), make sure the date is at least 7 days in the past
following https://topjohnwu.github.io/Magisk/install.html#samsung-devices
using odin4 from https://xdaforums.com/t/official-samsung-odin-v4-1-2-1-dc05e3ea-for-linux.4453423/
using that version of magisk -> app-release.apk
got this version of the firmware (from https://samfw.com/firmware/SM-T500/EUX/T500XXS8CXG1) -> –progress SAMFW.COM_SM-T500_EUX_T500XXS8CXG1_fac.zip
adb -s R9TR3087Z2J push AP_T500XXS8CXG1_T500XXS8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT_meta_RKEY_OS12.tar.md5 /sdcard/Download/
adb -s R9TR3087Z2J install app-release.apk
in the device, install, select file, use that file
adb -s R9TR3087Z2J shell ls /sdcard/Download/|grep patched
magisk_patched-28100_tELz5.tar
adb -s R9TR3087Z2J pull /sdcard/Download/magisk_patched-28100_tELz5.tar magisk_patched.tar
power off -> Vol Down+vol up + plug on the computer -> download mode check the OEM value -> OEM LOCK : OFF (U) -> OK check the KG status -> PRENORMAL -> need to wait for 168h
Prenormal: your device is temporarily locked, reaching 168h of uptime should trigger unlock
— https://topjohnwu.github.io/Magisk/install.html#samsung-devices ()
boot on the device again -> enable the wifi and automatic date to get the date to today (hence more than 168h after the time the bootloader was unlocked from the point of view of the tablet).
odin4 -b BL_T500XXS8CXG1_T500XXS8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT.tar.md5 -a magisk_patched.tar -s CSC_OXM_T500OXM8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT.tar.md5
You get into the recovery mode, wipe user data wipe cache
reboot
I get into the “security error only official released binaries are allowed oto be flashed (vbmeta)”
In the download mode, I can see it is back in prenormal state
I put back the stock image with
odin4 -b BL_T500XXS8CXG1_T500XXS8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT.tar.md5 -a AP_T500XXS8CXG1_T500XXS8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT_meta_RKEY_OS12.tar.md5 -s CSC_OXM_T500OXM8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT.tar.md5
following https://wiki.lineageos.org/devices/gta4lwifi/install/#pre-install-instructions, I can see that vbmeta can be flashed separately.
vbmeta.img is part of Android Verified Boot (AVB) — a security feature that ensures the integrity of your device’s boot process. It’s like the bouncer at the club: if something sketchy (like a tampered kernel or system image) tries to get in, vbmeta will shut it down.
— chatgpt ()
following lineage os instructions
Get vbmeta from https://download.lineageos.org/devices/gta4lwifi/builds (/ipfs/bafkreicsqdvj3kfdqrfzojtabvskuygvnnfspdjhkbe2okhgxylsojuun4?filename=vbmeta.img)
tar --format=ustar -cvf vbmeta.tar vbmeta.img
Do the same stuff to get the time to today and therefore get out of the prenormal state
odin4 -a vbmeta.tar
It asks to do factory reset in a recovery mode ish.
reboot
doing again the magisk steps, making sure to set the date to today again
adb -s R9TR3087Z2J push AP_T500XXS8CXG1_T500XXS8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT_meta_RKEY_OS12.tar.md5 /sdcard/Download/a
adb -s R9TR3087Z2J install app-release.apk
in the device, install, select file, use that file
adb -s R9TR3087Z2J shell ls /sdcard/Download/|grep patched
magisk_patched-28100_wapre.tar
adb -s R9TR3087Z2J pull /sdcard/Download/magisk_patched-28100_wapre.tar magisk_patched.tar
odin4 -b BL_T500XXS8CXG1_T500XXS8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT.tar.md5 -a magisk_patched.tar -s CSC_OXM_T500OXM8CXG1_MQB82507325_REV00_user_low_ship_MULTI_CERT.tar.md5
factory data reset
reboot
Now, that’s ok