APC SMX750i Failing Firmware Upgrade

[Ghoster]

Hello,

          I have an issue where a SMX750i is failing upgrade at 7%, obviously it starts the process and switches the UPS off, then that's where it stays.

I have installed a new battery pack - still fails the same

I have tried with UPS switched off - still fails the same

I would like to think I am doing everything right as I have no problem with other APC UPS's when using the same FirmwareUpgradeWizard_v4.2.1

UPS Firmware details:

UPS 09.1

MCU 09.1

UBL50E.7

MBL 06.0

The tool automatically selects SMT20UPS_10-2.enc

Any assistance would be great as I would really like to be able to enable the Modbus communications that the later firmware supports.

[APC_Matt]

Hi Ghoster

Could you try the latest firmware upgrade wizard 4.3.0 and see if that helps.

https://www.apc.com/uk/en/faqs/FA279197/ 

If it doesn't I can decode the FUW.log file it produces and see if that highlights the issue.

Thanks

Matt

[Ghoster · Accepted solution]

Hi Matt,

             Thanks for the advice, I must admit I did try and download v4.3 but that was only available outside of UK, seems like they have released it here now, the firmware file is the same.

What I did read on here is that someone had issue and were advised to do a factory reset if they had the 5 button version, I done that and found that upgrade via USB still failed but via serial then worked, so yesterday I was successful lifting it to v10.2 and giving me the Modbus communication.

Thanks again, and hopefully this will help anyone else with similar issues.

[robmir_apc]

I service several smart APC UPS and when updating their software I use their serial port and a computer with a direct to the motherboard serial  port and never a USB to Serial adapter.  Since the motherboard has a com1 socket I sourced a  rear backplate with the 9 pin male connector fixed to it, it's ribbon cable and it's matching  plug to the motherboard socket and installed the plate on my computer case. Unfortunately most of the  newer motherboards lack a rear serial port. 

So far it rarely give me a failed update and I highly recommend this way. I know it's old school but it works !!!!!