1. BIOS graphics is generated by BIOS firmware loaded into RAM. The Windows O.S. is not running yet. You may run BIOS and have it displayed only with RAM (with SSD removed).
2. So, I think that something was corrupted in Windows during update. If you can boot into Windows, I suggest that you Repair Install of Windows 10 with an In-place Upgrade Use Media Creation Tool method (step 6). You will keep all apps, programs and personal data, just as when you upgrade.
3. If you can't boot into Windows, you may return to the last working configuration from Advanced Option Menu. This menu you can reach after booting from Window Installation Media USB:
Hope this helps