i tried to install a toshiba Z20t-c-11g

OS: Windows 10 LTSB
Driver: complete

I tried to install the new BIOS from the drivers page on toshiba.eu.
That BIOS sadly does not work ...? Why?

Anyway... the problem i had and i wanted to have fixed is:

Bitlocker encrypted my whole drive.
it starts correctly and displays the keyboard.
GPO: Keyboard Slates (or something like that) is activated.
BUT: Touchscreen does not work. That means.. i can see the keyboard but it does not work.
thats why i wanted to update my bios but it says it is not working on my computer... well thats frustrating...
why offer the bios update when it does not work at all... or is it some sort of windows 7 only? cant imagine that tbh.

i guess the only problem is the bios but i could be wrong (z20t-b works on same settings for example)

Any help would be pretty nice. Thanks ..