Troubleshooting is a bitch. In the end, it was the 512GB USB - for reference, avoid this model: Sandisk Ultra Fit. It only works if Priiloader is set to do a fake stand-by mode, i.e. the one with the continuous green light and uninterrupted power to the USB ports. If power is instead interrupted, the USB will prevent normal boot and must be removed. Basically, the drive is incompatible with Priiloader and messes with its boot operation. No boot option or other Priiloader setting - apart from the "fake stand-by" method described above - allows to bypass the issue without having to remove the flash drive.
I will try a Western Digital 2TB 'My Passport' next. Anybody using one of those? How is compatibility?
I will try a Western Digital 2TB 'My Passport' next. Anybody using one of those? How is compatibility?
Last edited by Duamutef_MC,