How To Fix Pioneer Usb Error 23 ( Tested)
1. Plugin your USB Stick/Flash Disk to your PC or Laptop
2. Backup your USB Stick/Flash Disk Data
3. Install EaseUS Partition (All Version) on your PC or Laptop
4. Open EaseUS Partition select your USB Stick/Flash Disk path or directory
5. In top right area, klik convert GPT to MBR
6. Klik Apply
7. Format your usb partition to Fat 32
8. Restore your data, and test to your Pioneer device
Conclusion :
Pioneer head unit usb feature, today only support MBR format partition.