Firmware for M10k21

I have a M10k21 cpe 5g modem router but it came with a firmware 1.9.4 but the modem feature is not enabled. The modem is installed and it reads my sim and I get carrier info but it does not connect. It has the mesh+ firmware installed

To what extent is this related to OpenWrt?

Neither do we have any idea what "firmware 1.9.4" is supposed to mean, nor do I see this particular device as being supported by OpenWrt in the first place.