Use a virus-free USB flash drive formatted to FAT32 .
| Issue | Solution | |-------|----------| | USB not recognized | Try another USB (2.0, 4–16 GB) formatted FAT32. | | “File mismatch” | Wrong firmware for your hardware version. | | Device stuck at boot | Re‑flash using the method (rename file to flash.bin , hold Menu key while powering on). |
