Yeeeaaaaah,
after some longer struggle with installing them drivers I've made it.
So I had access to TWRP recovery again, did all that was described in the link you've posted. So now I have the tablet reanimated to live. That was the good point (Thanks for your help - and yes, I've also pressed the Thanks button).
The bad point is: I can't reboot into TWRP recovery. When ever I start it and press volume up after for several times when the sony xperia writing appears it boots into some android recovery, but not into TWRP
. But I need to go there, because I need to install google apps (they should be installed after the first reboot). For me it seems as if LineageOS overwrites the installed recovery when installing it.
Or am I doing something wrong?
---- Later ----
...ok, I reinstalled everything the same way, but this time I've installed LineageOS and google apps directly after another. It worked. But still, after OS was installed, TWRP recovery was gone. Or I need to do something different when booting...
So, if I am right, I can only use the pollux_windy version of the OS, because I have the Wi-Fi version of the tablet. This OS version can't be updated using the build-in update function. So how can I update the OS then?