RE: Nrf9151 Custom Hardware and PTI

Øyvind — Tue, 18 Nov 2025 09:31:43 GMT

Hello,

first of all, have you seen our Developer Academy and the following courses:

These provide a good starting point for how to develop applications using nRF Connect SDK

[quote user=""]it seems to work but, the version that is flashed is the PTI version and so i can only use PTI-related commands.[/quote]

Please download and program the latest modem FW v2.0.3 from the nRF9151 product page under Downloads. This should allow you to utilize all correct AT commands from the modem side.

[quote user=""]The major difference from my custom board is the absence of an external flash memory, besides the devicetree entry and the FOTA, is the SLM tied to the external flash anywhere else?[/quote]

Recommend starting with the new version, Serial Modem application in your development. Your application needs to have external flash in order to perform a full FOTA update. It's possible for modem delta updates without external flash. For full modem updates, external flash must be added. Have a look at Lesson 9 in the intermediate course (linked above).

Kind regards,
Øyvind