BC68 AT+CFUN=1 error

I use BC68 module in my device with Vodafone NB-IoT SIM. For some reason AT+CFUN=1 command returns error code +CME ERROR: 4.

Same SIM card works fine in BC68 development kit.

I have upgraded the module FW to BC68JAR01A10, but still returns the same error.

Checked all SIM connections and they all seem fine. However USIM_DATA, USIM_RST, USIM_CLK, USIM_VDD pins are zero volt at all time.

Does anyone have any idea why this might happen? Could BC68 module be faulty?

Thanks!

Hi Tay
The SIM card is not recognized.