Instead of flashing BIOS screen went insane

[Avtem]

i have Lenovo T430. Successfully Downgraded BIOS to 2.81.
Followed every step from README.me and watched console output - did not notice any errors. Every step was completed successfully... and when i switched boot mode to "Legacy only" and booted from USB stick my screen literally went insane (see the photo). It seemed like it was repeatedly repeating the same 3 characters.

Fortunately, shutting down did not cause any damage.

Link to the contents of the Flash Drive: https://drive.google.com/file/d/1xAScgmx2Xh9TQVcKXw_cL5cqfkNAKbe9/view?usp=sharing