BC660K-GL-TE-B MQQT error


I’m testing BC660K-GL-TE-B development board and I want to test MQTT connection to the server. When I send any AT command regarding to MQTT, module returns error without any error code as shown in this picture:

Is it possible that this error could be caused by old firmware which seams to be “BC660KGLAAR01A03”?

If so can you provide me with newest firmware and flash tool with some documentation?

Flash tool

I have sent the latest firmware version to you via email, please check.
error is returned, usually to check whether the current module successfully registered the network

Thanks! Upgrading to the latest firmware did a trick!