Firmware Upgrade fail, DL_Firehouse, Time out!

Trying to upgrade my firmware to RM520NGLAAR01A08M4G

Current firmware
[2024-09-09 07:48:27:702_S:] ATI
[2024-09-09 07:48:27:760_R:] ATI
[2024-09-09 07:48:27:760_R:] RM520NGLAAR03A02M4GA

[2024-09-09 07:48:27:760_R:] OK

This is windows using qflash_V7.1

Also, what is the difference between Certified Firmware and stock firmware?

Dear @Bradmu
How many did you try?
There are some ways to try:
1.When upgrading again, please power down and re-start.
2.Unload firewall and reboot PC
3.In stage of upgrade, please close other serial port too or the service that accessed to the serial port
4.The Chinese character, space or bracket are not allowed in tool or firmware path. It will be better to place in the local disc D, E or F.
5.The utilized USB cable and the external power supply to the UBS and HUB shall be industrial.

Rebooting the pc solved the problem, can you answer my other question what is the difference between the bases(Certified and stock)?

Dear @Bradmu
Certification firmware meet the requirements of the operator, like a customized firmware.