i've messed it up

hi folks!

i was looking for solutions for my problem for days now - with no working result.
i know, there are many threads out there, but - as said - none of em helped to fix it.

I deleted the complete system with twrp by mistake.

I'm glad that i got twrp and bootloader unlock back working and i also managed it,
to put a system back on.

but this is only booting into lockscreen and when i'm going to unlock - it turns on a
white screen with htc-logo.

strange thing is: power-off menu is alive (turn off, flight modus, restart...).... but that's all.



Anyone dare to help me out?
I'd really appreciate it :)