[LegionGO] Stuck on boot logo with SteamOS

Hello everyone, my sister got a Legion Go (the first one, not the S or 2 series) with SteamOS installed and after a crash which necessitated a forced shutdown by holding down the power button it now gets stuck at the Legion" logo while booting.

I've been trying to find a solution, but the BIOS interface and options are completely different from what I could find on the SteamOS support, so I'm quite stumped about what to do.

Thanks in advance for the help.