Okay. I'm gonna test something, but first, I want to disclose that I ordered a new case with a dual-fan cooling system for my RPi 3 recently because I know that my Pi 3 boots up Raspup just fine and stuff.
Anyway, this is might sound crazy, but...I now actually have a theory on why my Pi 4B 4GB model won't boot Raspup. I got a desktop kit for Christmas last year, right? It was given to me instead of a Pi 400, because Santa couldn't afford it that same year (don't ask). Anyway, the desktop kit came with a fan along with 2 heatsinks for keeping the system cool in high-performance situations. So, here's my theory: Raspup won't boot because it doesn't have the necessary files or settings to boot with the fan on the Pi 4.
To test this, I'm gonna test the Pi 3 with both fan on and off using the new case. Then, depending on the test results, I'll sincerely consider running Raspup on Pi 4 without the fan that came with the desktop kit.
Pray for my sanity, because if my theory is correct, I will be absolutely livid at myself (and probably at some Amazon sellers for not having Pi 400 available soon enough). Like, really mad and stuff, y'know?
Anyway, thanks in advance.
Sincerely,
r96chase