[Galaxy Tab S2 Android Development] metterschling:
LineageOS 18.1 UNOFFICIAL for 2015 Samsung Galaxy Tab S2 SM-T715 ONLY​

Model: SM-T715 (LTE) - gts28ltexx - 8" screen, Exynos 5433 SoC, LTE

This is the ONLY model that the ROM will work on.

There is NO ROM for the T710, T810 or T815 in this thread. Questions about T710, T810 or T815 will be completely IGNORED.

For T710 please use the equivalent ROM at its separate XDA forum thread.

For T810 please use the equivalent ROM at its separate XDA forum thread.

You MUST READ posts 1-3 (about 10 minute read) before deciding to install this ROM. If you think this is an unreasonable request, then stop reading now and find another ROM. Thank you.

DISCLAIMER

I am not responsible for lost data, identity theft, lost money, security vulnerabilities, bricked devices or any other hardware or software malfunctions that comes as a result of flashing this ROM.

All involved in bringing this build to you are working voluntarily on it in very limited spare time, and their other life commitments have much higher priority. Don't expect a prompt, or even any, response to questions and bug reports.

Before attempting to install this ROM

1. Ask yourself: would bricking your device be a disaster for you? If yes, don't try this ROM! It can't be guaranteed stable and reliable enough to depend on for daily use.

2. BACKUP YOUR DATA AND EXISTING ROM. Be prepared for a complete restore if anything goes wrong.

3. RESEARCH adb, fastboot, Odin/heimdall, and TWRP and how to use them, if not already familiar with these.

What works

camera

bluetooth

wifi

GPS

brightness, sensors

audio through loudspeaker

audio through headphone jack

audio over bluetooth

SELinux enforcing

DRM level 3 (SD definition)

deep sleep

RIL - mobile data and telephony/SMS/Cell Broadcast - some limitations for telephony audio options apply, see below

vibration and haptic feedback

hardware buttons and lighting

What doesn't work

fingerprint. As retiredtab wrote in post 1891 at

https://xdaforums.com/t/...t810-t815-t815y.3879302/page-95#post-85533725

the team will not spend anymore time looking at fingerprint. If you need fingerprint to work, stay with stock Samsung ROM.

DRM level 1 (no HD definition). There's more detail in post 1891 above. I will not be trying to achieve level 1 for HD definition. If you need HD definition for your streaming media, stay with stock Samsung ROM.

If you charge the device while it's powered off and then want to power it on, you MUST wait at least 30 seconds AFTER disconnecting the charger cable before pressing the power button otherwise you might run into strange boot problems such as the touch screen not working. While recent builds solved the touchscreen issue, you still might see excessive battery drain until you perform another reboot.

For telephony audio, currently only the loudspeaker option is working. If you try to use/switch to bluetooth audio during a phone call, the audio stack will go wild and afterwards loudspeaker will stop working too until you perform a reboot.

Please note that for an incoming call, it might take a couple of seconds until both sides can hear each other.

I have invested a lot of time trying to troubleshoot the audio routing, and this is for sure a device-specific issue most likely due to the the old Samsung binaries so chances are almost zero to get that fixed.

Possibly other features that I haven't tested or do not use.

Source Code

See FAQ 1 for links in post #2.

Thanks

LineageOS team for the upstream source code.

@retiredtab, @ananjaser1211, @lpedia, @Yogi555 and @CuckooPenguin for spending nearing 1 month fixing the 2 most biggest bugs in 17.1 that plagued users for nearly 10 months: the wifi instability and random reboots. These are discussed in detail at

https://xdaforums.com/t/...rs-running-any-version-of-android-10.4308193/

https://xdaforums.com/t/...rs-running-any-version-of-android-10.4308203/

A special shout out to retiredtab for providing the T710 ROM and code here which is the base for this ROM. Also this ROM would not have been possible with all the help and mentoring he provided during the past 6 months of development. Also many thanks to lpedia and bluess57 for their outstanding hints and tips.

All past contributors of the exynos5433 code, especially ananjaser1211 for his major contributions and @ripee for working on prior gts2 builds until end of 2021.

@rINanDO for his lmkd spam fix in 18.1.

Alpha testers: simon-edwards for the many hours testing and helping troubleshooting RIL, SELinux policies and various gapps options; Don K and Sir Thopas for addional RIL model testing.

@bluess57 for his excellent code donations for the gts2 LTE models.

retiredtab and lpedia for providing the blueprint for this forum entry and the FAQ in post #2 and constantly improving it. This work is just a little contribution standing on strong shoulders of previous contributions.