Its a new module that I received recently. I did some testing with AT command and a SIM card. I could validated it connected to the network and was working well. The firmware version said v3.0.0.15
Then, I performed the DFU BLE upgrade.
I am going to try flashing directly with the J-Tag port but I don’t have the hardware yet.
One additional point. I initially tried the upgrade using an iPhone but it wouldn’t connect to the device. I then tried with a Samsung Android phone and that one worked.