So the issue about rpi5 not booting is closed;

I made this account to let you guys know tho, if this happens its likely due to the filesize of the sdcard but you aren’t sol. Hold the button next to power cord port as it boots till it goes green w a usb keyboard at the ready and ur iso on a usb. Hold shift when u have the option appear to shift for network boot or esc for diagnostics appear and u will load rpi imager and Im assuming I do not need to explain from here; update after getting past the initial fail to boot I no longer have to press the button on the pi itself even switching to a new sd card. Just hold shift @ appropriate time