Do you have a like the RT809F to write this dump directly to the chip, or are you trying to update via USB ?

: Ensure your USB drive is formatted to FAT32 before placing the firmware file on it.

is a critical software component required for repairing TVs with corrupted firmware or "stuck" boot screens. While official firmware is typically distributed through TCL Support , low-level "dumps" (raw memory backups) are often hosted on specialized technician forums.

: If the TV boots but has display issues (like a mirror image), you may need to enter the Service Menu by pressing Menu > 119 or Mute > 119 on the remote.

The backup dump file for the mainboard used in the TCL 32B3700

: For many TCL models, you can trigger an update by inserting the USB drive, then holding the physical power button on the TV for roughly 10 seconds .