[Galaxy Tab S2 Android Development] xbt-:
FYI I tried to upgrade to the latest TWRP (twrp-3.6.0_9-0-gts28wifi.img.tar) on my T713, but it failed. I used latest Odin (Odin3 v3.14.1_3B_PatcheD).

However, I reflashed the original TWRP from this thread (twrp_3.1.0-1_sm-t713_14417n.tar) and it worked again.

I also then tried downloading the img file (twrp-3.6.0_9-0-gts28wifi.img) and flashed inside TWRP (to Recovery). Still no luck, still went to download mode after failing recovery.

Next I tried the next one, except that @ripee modded it to fix a bug on hw

Post with download links here

The one I used was twrp-3.5.2_9-2-gts28vewifi and I flashed it in Odin. It worked! Now I'm on the latest version of TWRP that's working as of today.

So if you want the latest TWRP, use that one.

p.s. now apparently my CPU is not over 30,000 degrees C (55,000 deg F)! lol. It was obviously a bug with the previous version that excluded the decimal point, since now it's 30 deg C.

Next I installed Lineage OS 17.1

and also Open gApps Pico (this version is just the Play store and Play Services)

Attempts to install Supersu directly after Lineage OS failed, I will have to reboot first I suppose. It's booting! I'll be able to see then if it's still rooted after the whole format and wipe of the whole system to install LineageOS. I have a feeling I'll have to root again separately after it boots.

Update: Had to install magisk.apk and then rename magisk.apk to magisk.zip, then reboot into twrp and flash the zip. It worked!

Instructions from my other post:

Flashed Lineage OS 17.1 and open gapps pico on my T713, clean install, and it took over 30 minutes at the curved line logo with the circle moving right to left (loading screen at boot).

Then found another thread that said it should take only like 15 mins (edit: after my own experience, it takes only like 5 mins or so - if it gets stuck by 10 mins, then force reboot and wait a min and it will go to welcome page).

Since this is an OLED screen, I'm worried about screen burn in, so I don't want to leave it with that bright blue line fixed in the middle overnight. Going to try a couple things. I shut off and back in recovery now.

This time I did this:

Wipe all like in wipe instructions

Reboot back to recovery

Mount System too so the following are mounted (for me System was not mounted, not sure if it matters)

- System, Data, Cache, MicroSD

Install LineageOS only (will install gApps later, this is to isolate is lineage is the problem)

Click the Wipe Cache/Dalvik

Reboot

After about 5-10 mins I decided to search the thread. Someone said they just forced reboot (hold power and voldown in my case until it reboots),

It worked! After a minute or two when it reboot, it just went straight into the welcome page (white screen with blue LineageOS logo). Success!

Now I turned it off (hold power and press power off) without setting up and installed gapps, and wiped Cache/Dalvik and reboot, and after another minute back into welcome screen - this time the gapps welcome screen!

Pressing the yellow Start button lagged a little. But after a few seconds (I clicked a few times) it went to the next screen!

Then after skipping wifi setup, it asked forone of three options with fingerprint+pin, etc, well just pick one, on the next screen there will be a skip option if you don't want to set it up.

First courses of action:

Enable dark theme! It's under Display. Search didn't work for some reason.

Disable Play Protect (I don't want it)

Security > Find My Device > Off

Turn off Bluetooth

About > tab on Build Number a few times at the bottom to enable Developer

System > Advanced > Developer Options > Automatic System Updates > Off

System > Advanced > Developer Options > Advanced Restart > On

System > Advanced > Developer Options > Override Force Dark (always on)

System > Buttons > Backlight > Disabled

Next

Root

Add Xposed (LSPosed)

Add LSPosed modules

Flashing SuperSu like the root guide says, doesn't work. Instead, install Magisk. Then reboot.

Had some trouble. Then I came across this:

Installing Magisk is extremely easy on this ROM:

Download the Magisk app from github (link updated to github)

Install the APK file

Rename magisk.apk to magisk.zip

Install magisk.zip from TWRP.

It worked! I'm rooted! That was not intuitive, but easy!