There is? I searched through pretty much all the threads, all labeled as f/l/x, can't seem to find one that works yet Now I am stucking with a tablet with twrp recovery and no working rom to use. Going back to stock, seems wayyy more work...
edit: Holy, I can't believe this actually works in the end... what a ride.
So, affterrrr going back to the stock rom, version 7.1.1 from another thread, the OEM unlock button actually NOT grey out anymore. (Guessing the 8.1 actually greyed out your oem unlock button). Unlocking the bootloader is only matter of a single command > fastboot oem unlock-go.
So I was like might as well give this v17.1 another try, flash twrp 3.4.0-120408 (updated version I think, latest one I can find) > wipe, reboot recovery > flash rom > reboot > and it works!! Not stucking at the loading screen anymore, yay!!!? Then, bluetooth is crashing as soon as I get the past the loading screen. Finally went back to v16, and everything works so far....and flash the 17 again after 16, and bluetooth issue is fixed, everything works nicely!