Howto enter failsafe after reboot / bootloader time set to "0" acidently

So, reinstalled /root and it was ok, releave for a second… updates installed, system hangs again, i get fatal errors and cannot acces gui neither in normal boot mode or failsafe mode.

is there command for terminal that can exclude, restrict or unninstall last updates?

This could be a problem for me as i need my computer for graphic manipulation daily…