Surface Pro 7+ - multiple errors

Help.

I installed some hardware updates, and now my Surface is stuck in blue screen loop.

The loop starts with a black screen saying "Your device ran into a problem and needs to restart. You can restart." with "Stop code: KERNEL_SECURITY_CHECK_FAILURE (0x139)" at the bottom. (the device doesn't turn off on it's own at this point at all) When I turn it off and turn it on again, it goes into blue screen with 0xc0000001 error, only F8 and F10 keys are working. Then "File: \WINDOWS\system32\winload.efi" with error code 0xc0210000, again only F8 and F10 are working. Then BitLocker requiring a key. I input the key, and then get 9 options - and none are working. Whichever I press, the loop starts again.

Sometimes I get a black screen "Edit Windows boot options for: Windows 11

Path: \WINDOWS\system32\winload.efi

Partition: {(a long sequence)}

Hard disk: {(a long sequence)}

[ /NOEXECUTE=OPTIN /HYPERVISORLAUNCHTYPE=AUTO /FVEBOOT=2125824 /NOVGA

(edition line here)]"

I have unplugged both mouse and keyboard early on, so it's not very likely that they're the source of errors.

I've tried making a USB with recovery image, but the Surface doesn't read it fully - my USB has a tiny light, and it flickers for a few seconds only when I choose options 4-6 (they're safe modes), but then it goes back into the reset loop.

I've tried searching for solutions, but I can't find any that answers all 4 at the same time; and when I'm searching individually all of them say "wait till Windows boots, and then go to Start menu"... and I obviously can't do that since Windows doesn't boot.

Any ideas?? I feel hopeless :((((((

(sorry for any spelling or translation mistakes, my Windows (and I lol) operates in Polish)

(I also posted this on Microsoft Tech Community forum)