Hi Mark, The firmware Revision is curently:1529B04SIM7000G It looks like there is at least a B05 version available, not sure if that is the latest version though: https://github.com/Xinyuan-LilyGO/LilyGO-T-SIM7000G/blob/master/docs/How%20t... The usb drivers provide separate COM ports for AT commands, NMEA etc so it seems odd that the UART doesn't. Kind regards Derek