nRF9151 is preprogrammed with the Production Test Image (PTI) modem firmware. PTI supports a subset of AT commands for testing in non-signaling mode. The modem firmware must be updated for signaling mode testing and end customer use.
The %SHORTSWVER AT command can be used to check the version of the preprogrammed modem firmware. For more information, see Short software identification %SHORTSWVER in nRF91x1 Production Test AT Commands Reference Guide.
Available PTI firmware releases for nRF9151 are available at nRF9151 Downloads.
For more information on the PTI modem firmware, see Production test features in nRF91x1 Cellular AT Commands Reference Guide or nRF91x1 Production Test AT Commands.