MA2 Ultralight wont boot after update to V3.9.63.6. Help me troubleshoot.

Hi everyone, the most important information is stated in the title. Console updated correctly and booted straight up after Firmware update in the warehouse. On Site, after transport it never booted, but only showed following error messages in the 5" screen.

I manually needed to press "ma2 ultralight v3.9.63.6" in the startup menu, then following lines popped up:

- error: can´t find command "search.file"
- error: can´t find command "echo"
- error: can´t find command "search_"
- error: can´t find command "load_env"
- error: can´t find command "linux"
- error: you need to load the kernel first
Press any key to continue

After a few minutes in this state the 5" showed following:

                        GNU GRUB version 2.00

Minimal BASH- like line editing is supported. For the first word [possibly more but unreadable due to sunlight] lists posible command completoins. Anywhere ese TAB lits possible device or file completions

Trying memory test or the third option resulted with the same outcome.

Has anyone experienced this before and is there a fix without sending the console to service?
Cheers!