According to the Banggood Official Manual , you can update the board following these steps:

The rr52c03a firmware's extra quality makes it suitable for a wide range of applications, including:

Right-click the drive, select , choose FAT32 , and click start.

: If the screen shows artifacts or doubling after installation, the firmware or the "bitness" (6-bit vs 8-bit) may need to be adjusted in the service menu. Key Features Summary

HDMI, VGA, AV, Audio In/Out, USB (for media playback and firmware updates), and RF (TV Tuner)

The Ultimate Guide to RR52C03A Firmware: Unlocking "Extra Quality" Performance

Specific files for Full HD (1920x1080) or HD Ready (1366x768) that prevent screen "tearing" or stretching.

Before updating firmware, it's wise to back up any critical data on the device. Some updates might reset the device or, in rare cases, cause data loss.

: Place the RR52C.bin file directly in the root directory of the drive (do not put it inside a folder). Initiate Flashing : Insert the USB drive into the board while powered off. Connect the 7-key button board.

: DVB-T2, DVB-T, DVB-C, and analog TV (PAL/SECAM/NTSC).