If the BIOS screen isn’t showing right, then I’d really have reason to suspect a hardware failure. I see that the screen is roughly divided into two sections in both images, which is far too consistent to be coincidence. On the subject, I think it is mere coincidence that the failure occurred after an update.
I’ve recycled a lot of hardware in my time, both personally and professionally. My workplace is a manufacturing facility so it’s particularly hard on physical equipment. I’ve seen things I would never expect to have problems with fail at the strangest of times. When things get really weird, the parsimonious solution is to assume hardware failure.
Anyways, do you have an external display you could plug in? Do you have another machine (even your phone) you could use to
ssh in with (assuming you have the server installed)? I’m sure there’s ways you could salvage the machine if you really wanted to.