Samsung Galaxy Tab S4 10.5

Samsung Galaxy Tab S4 (SM-T83X)

Device

Everything works, except stereo sound and s-pen optimizations.

Steps to install

1. Flash ARK4 firmware. This is the one i tested with, newer versions should also be fine but i cannot guarantee.
   You can get the German T835XXU2ARK4 firmware (Oreo) here:
   https://www.sammobile.com/samsung/galaxy-tab-s4/firmware/SM-T835/DBT/
   That website also includes instructions about flashing the device using Odin, which is a windows application. Unfortunately, heimdall (https://glassechidna.com.au/heimdall/) does not support this device.

2. install TWRP: https://twrp.me/samsung/samsunggalaxytabs4qcom.html
   You can use Odin to install TWRP. Remember to boot immediately into recovery after flashing TWRP and wipe userdata, otherwise the stock recovery image may be re-flashed when you boot the stock system image.

3. Flash modesty kernel from here
   The modesty kernel has updated fstab entries in its device-tree that disable verity checks. The GSI won't boot unless the system-image verity check is disabled.

4. reboot into TWRP and flash an oreo arm64 a-only gsi:

# use the TWRP ui to mount /data.  You may need to do Wipe \ Format Data first.
$ adb shell mkdir -p /data/local/tmp
$ adb push system-arm64-aonly-gapps-su.img /data/local/tmp
# now use the TWRP ui to flash this image (it is under the "Install" menu)
# reboot

Hardware support

Component	Comment
Camera	Working
Speaker / Mic	Mic working, Speaker: mono, only bottom speaker
Bluetooth	Working
WiFi	Working
SIM / Mobile Data / Voice	Working
VoLTE	Working
Fingerprint	N/A - Samsung Face Unlock does not work either (obviously)
NFC	Working
Offline Charging	Working
Other feature	S-Pen works, displays as Mouse pointer

---

Fixes:

S-Pen Mouse pointer:

Add the following line to /system/usr/idc/sec_e-pen.idc touch.deviceType=touchscreen

Lock-Screen Rotation

Add the following line to /system/build.prop lockscreen.rot_override=true (this no longer seems to be necessary) Make sure to set permissions of /system/build.prop to 0600 otherwise you will get stuck at the boot animation. (this no longer seems to be necessary)

Tested By: @mKenfenheuer - SM-T835 (Germany), Firmware Version ARK4 - 08.05.2019

Updated by @jamuir

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