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?