Switch DVR to USB flash mode
- Connect USB
- Press Reset
- Press and Hold MENU
- Short press power while holding MENU
Windows should detect device like:
Drivers are inside DirectUSB folder
Flash .elf firmware
- Start DirectUSB
- Choose Board: a7lbub. Press Connect.
- Press EraseNand
- Choose .elf firmware file. Check Verify.
- Press Download
- Reset DVR