Error receiving response after sending NASGetServingSystem 3000

Hello, I keep getting the following error : “ERR NASGetServingSystem error 13” I am using a RM500Q module.

could this be a problem of the firmeware? or configuration? I am using firmeware :RM500QAEAAR11A02M4G_01.007.01.007

Dear @jay48s
Please give us more infromation. What is your test procedure? it is better to share log to us.

I have sent the latest firmware to you via Message, please check.