[Error Code: Verification Failed] ──> Check file name/corrupt download [Error Code: Device Not Detected] ──> Install OEM USB drivers / Change USB port [Error Code: Loop Boot Cycle] ──> Perform a full factory wipe in Recovery Mode Problem 1: The Device Does Not Recognize the Update File

Before downloading any updates, you should verify your current BIOS or firmware version to see if an update is even necessary.

Unplug the main power supply or remove the battery if it is external.

Follow this sequence precisely to update your ZL782MBV21 board without interrupting the power supply.

Watch the onboard indicator LED light. It will start flashing rapidly, indicating that the system bootloader has successfully detected the update file and is rewriting the internal flash memory.