Double-check that your ROM files are in the correct format. Many optimized emulators require .gba for Game Boy Advance, .bin/.cue for PS1, and .nes for NES. ZIP files may need to be unzipped depending on the firmware build.
Installing custom firmware can void the device's warranty and may carry some risks, including the potential for bricking the device. Proceed with caution and at your own risk. x12 plus custom firmware updated
Download a tool like GUIFormat (for Windows) or use Disk Utility (for Mac) to format large cards to FAT32. Double-check that your ROM files are in the correct format
Once you have downloaded the correct .img or .bin custom firmware file for your specific X12 Plus hardware revision: Open or Rufus on your PC. Select your downloaded custom firmware image as the source. .bin/.cue for PS1