If you see a black screen or "No cores found," your USB drive was mounted too late. Restart the device with the USB already plugged in.
It is possible that the query refers to one of the following: 1. RetroBoot for PlayStation Classic retroboot 121
RetroBoot 121 (hereafter RB-121) is designed to be a "thin abstraction layer." It does not seek to replace the operating system but rather to provide a standardized environment for loading kernels, diagnostic tools, or ROM images from non-standard storage media (such as SD cards or Flash memory) on hardware that originally relied on floppy disks or ROM cartridges. Retroboot 121 Troubleshooting: If you see a black