I needed to install TWRP in fastboot again.
Reboot to twrp.
Format DATA.
Reboot to TWRP.
Install 10.0.16 (MI 10 PRO)
Wipe Cache/Dalvik .
Reboot.
Normal install without twrp install in Fastboot causes Error 7 during install.
Did this also with 10.1.17 , but still camara error.
So I'm back to 10.0.16