@QRene Thank's, I didn't think to look at the firmware change log. Oddly, the previous update from 2021 also says: Newly supported HUAWEI E3372h-320 dongle. However, this model is hard to find, it...

Hello, Can anyone recommend a known-to-work 4G modem dongle that plugs into the USB port of a VR600 as a backup connection? Thanks for any help.