Can't get bootable USB to work on PC with Gigabyte GA-78LMT-USB3 motherboard

[Windows Server]

Hello,I'm currently trying to fix my desktop PC, which is quite old and has a Gigabyte GA-78LMT-USB3 (Rev. 5.0) motherboard. The PC is stuck in an Unmountable Boot Volume loop, and I'm trying to fix it using Windows Recovery Environment, but I can't access it in the first place. The usual methods of restarting or shutting down repeatedly during startup aren't working, so I'm now trying to access Windows Recovery Environment using an installation media, as outlined in this tutorial (starting from timestamp 4:40):

View: https://www.youtube.com/watch?v=Mqjy4sOQhi4However
, I'm struggling to get a bootabl

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