We have many RUT230 and I tried to update three of those for RUT2_R_00.07.01.2. It seems that they stop working (they do not connect to the internet) because of the ???? issue. Sometimes, if I set APN manually, they may connect to the internet but if I reboot the device they lose the connection and I can't connect them anymore. The operator is Elisa (Finland).
I found the following from the gsm.log
The modem inside is Quectel UC20.