I inherited a fleet of RV50, RV50X and RV55 routers. The vast majority are RV50. Service is via Verizon. The previous person terminated our Air Link Management Services - AirVantage (I think that is the name) subscription.
All devices were still running the firmware they had when the device was purchased. I have been going through the fleet over the course of the last year as the devices return to the shop and updating them to the latest firmware and putting a common template on them.
Two of the devices were on 4.12.0. They had the same modem firmware between the two devices. On all the other modems with newer OSs, the OS update process would ask for matching modem firmware, but on the first 4.12.0 when I went direct to the 4.16.0 OS, there was no prompt for the modem firmware.
For the second device, instead of going straight to 4.16.0, I went 4.13.0.017, on up through 4.16.0.021 for each OS available on this site: https://source.sierrawireless.com/resources/airlink/amm/gateway-software-packages/
The second device did update modem firmware during the OS upgrade without any issue and it now attaches to cellular.
On the first device, I then tried to downgrade the OS to 4.13.0.017 and do the same cycle back up. Once I went back up to 4.16.0.017, I can now see the modem on the first device, but I can not get it to connect. I have swapped the SIMs with other working modems and the problem stays with the first device.
My next troubleshooting step would be to restore the 4.12.0.028 version of OS, but that is not available on the link above.
My first question, what can I do to try and recover this device? I do not need it in the field at the time, but it would be nice to get it off my workbench and have it ready for the next time I do need it.
My second question, can the 4.12.0.028 link on the above site be fixed. This would allow me to try and downgrade to the version that was on the device before the problems.