[Thinkpad Tablet Android Development] wilvanwil:
phew...... already had checked, what next tablet I was going to order... but after 2,5 days of trying and trying, I got it to work! Android 10 and at least google play... First impression is that it is working fine... Hope my daughter will not be mad as all her apps needed to be reinstalled ;)

Movies/youtube/bluetooth/casting seem to work fine, gaming I need to hear from her...

The tablet had the sudden restart issue, had it repaired under warranty, but the issue came back after warranty period.... not often, but one or 2 times a week...out of the blue. Hope this helps it solving it...

(TB-X704F (Wifi)) Lenovo Tab4 10 Plus

Anyway, after the instructions I got Lineage 17 installed fairly quick, not sure if I already installed the Lenovo drivers before, but from the start I got connected to my PC quickly. I must say the after installing fastboot and adb on my PC, that works fine with the TWRP. Just paste the prompt in the command file on the PC, and TWRP will show on the tablet.(make sure the TWRP image file is in the same install directory on your PC as the fastboot and adb files).

https://www.getdroidtips.com/android-10-lenovo-tab-4-10-plus/ (the part where it states you need to get twrp on your tablet is not needed when you get connected to your pc))

https://xdaforums.com/thinkpad-tablet/general/twrp-root-tab-4-plus-tb-x704l-f-tb-t3664407

The first time I had not installed the Google apps...(missed the part you need to install gapps or similar before rebooting). And I could not find a way to get the play store on the tablet... errors when using a downloaded apk... So wanted to restart allover.... Rebooted, cleared all I think, but didn't get the image loaded again.. TWRP just kept trying, but not doing anything... Retried, retried... retried several things, but nothing anymore, so frustrated I used the official Lenovo site(Rescue and Smart Assistant (LMSA), https://pcsupport.lenovo.com/us/en/...er-list/component?name=Software and Utilities )

to get the official rom back on. Thart worked partially, but then after rebooting the tablet wouldn't finish the first setup, after 27 seconds, it would freeze and restart. Frustrated again. But, when I got in the boot menu(hold power and vol+ button pushed together), at least I was seeing on my pc there was some sort of setup done. I was able to copy files to the internal storage.

After a couple tries though, I decided to get the image files of lineage 17 and opengapps on a microsd card, so I wouldn't have to copy them anymore, I was able to easily find the SD storage in TWRP.

So for anyone who thinks your tablet will not going to work anymore because it's only rebooting, or not going to get through the first install, there is hope! :)

(as I tried so many things, I''m not 100% sure the order of all I did in the following is as I state, there was no need for me to install SuperSu or TWRP on my tablet, I have not used SuperSu at all, and TWRP gets loaded on the tablet from my PC, the link to the "root" instructions(steps 1-5) helps you to start TWRP from your PC, also make sure to do the OEM UNLOCK part!)

So as a last resort, I went into fast bootmode, then to Recovery mode, there I did Wipe Cache, then Wipe Data Factory reset, then I did mount system.

Then I did reboot to bootloader. I connected TWRP again(via PC, command prompt), and I took info from several websites... sorry for the safety, but I did not care about the OTA part, I did not care about a back up anymore, and I first wanted to "clear" all from the tablet, and hope to get it going finally.

I'm pretty sure I did not reboot it to system anymore, just to the fast boot mode/bootloader(keep pushing power button and vol+).

IF TWRP MIGHT GET STUCK SOMEWHERE IN THE PROCESS(NOT RESPONDING ANYMORE), ONLY REBOOT TO BOOTLOADER BY PUSHING POWER AND VOLUME+ UNTILL THE BOOTLOADER MENU APPEARS. Then load TWRP from your pc again.

TWRP: Make sure to untick the "auto reboot" in the general settings. Do everything in the settings to prevent auto reboot.

In TWRP I went to the WIPE menu, Advanced wipe, selected everything except usb or SD card storage.(so system, data, internal storage, cache etc.). Swipe to wipe. (no reboot)

Also do "Format Data" where you need to enter "yes". Check everything except external/sd storage.

Do NOT REBOOT.

Then to the Mount menu, I mounted the data, the system, cache, dalvik, vendor, AND I UNTICKED the Read only part. Then you push "Select Storage", and I selected Internal Storage. Back. (remember no rebooting!!!)

Then go to Install, Select storage, in my case the SD card, select the Lineage OS17 zip file, and swipe to confirm to flash it.

DO NOT REBOOT YET, otherwise your Google apps will not get loaded!!!

Shouldn't take too long, go back, and then also flash the Open Gapps(or any compatible Google apps zip file you have)

Then after that one, reboot, and keep your fingers crossed....

Keep trying, I was almost throwing the tablet out of the window, but it worked for me finally, and so far so good :)))

(1st thing I noticed in Android 10, in the Storage menu, there's an option to move data/apps to SD card in one go.. you don't have to do it app by app... it will detect and move it for you ... keeps the internal storage more free than before... nice)