Airvantage FOTA -- followed instructions, got error

Trying to upgrade the firmware on an MC7455 SKU 1103789 from SWI9X30C_02.24.05.06 to MC7455 Generic Release 27. Modem is set to mbim mode, and I performed the following:
at+wdss=1,“vzwinternet”
at+wdsc=3,1440
at+wdss=1,1
then I initiated firmware update vi the Airvantage FOTA web site.
Failed with the following message:
“The selected firmware is not compatible with the current firmware on the device. Please check the name and type are consistent with the devices firmware ones.”
Any ideas?

Also, I’m unable to modify IMPREF:
AT!IMPREF=“GENERIC”
Error
AT!IMPREF=“VERIZON”
Error
AT!IMPREF=“AUTO-SIM”
OK
Cannot change away from AUTO-SIM mode. I thought this might have something to do with Airvantage FOTA thinking there is a firmware mismatch. (Yes, I entered at!entercnd=“A710” first)

Hi @perrysteger ,

Could you please issue “AT!IMPREF?” to show your image information ?

Please also provide the URL of your desired FW on AirVantage.

Thanks,