: Use a drive with 8GB or less, formatted to FAT32 .
| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | Firmware signature mismatch | Wrong file for P638 variant | Double-check model number – HKTRT2841P638 vs HKTRT2841P639 are not compatible. | | Flash write failed at 0x... | Bad block in NAND memory | Run nand scrub (destructive) or contact tech support. | | TFTP timeout | Firewall or incorrect server IP | Disable Windows firewall, use static IP. | | Bootloop after update | Corrupted configuration sector | Perform a factory reset: short CONF pin during boot. | hktrt2841p638 firmware new
After you have successfully installed the , do not assume everything works. Run these tests: : Use a drive with 8GB or less, formatted to FAT32
: The standby light should start flashing rapidly. Release the button and wait for the "Software Upgrading" screen to finish. Do not power off during this process. Troubleshooting | Bad block in NAND memory | Run