https://devzone.nordicsemi.com/f/nordic-q-a/126502/nrf9151-firmware-changesHi all I have some trouble with a new batch of nRF9151 chips. The old one had the Firmware: 2.0.2 The new ons have the Fimrware 2.3.5. My application does no longer run, cause some AT-Commands retrun ERROR and I don&#39;t know why. Same HEXen-USTelligent Community 13Wed, 14 Jan 2026 11:52:11 GMThttps://devzone.nordicsemi.com/thread/558687?ContentTypeID=1Wed, 14 Jan 2026 11:52:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:daea38f8-f2e2-4cff-8cec-fe2c06d4196aBenjamin<p><span>Yes, they are. Happy to hear everything is working now.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/558685?ContentTypeID=1Wed, 14 Jan 2026 11:37:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:92c19535-35c5-494b-819b-a492741422c8AraCom-MBu<p>HI Benjamin</p> <p>thanks a lot. that was my problem.&nbsp; Are all&nbsp;<span>nRF9151&nbsp;shipped with the PTI Firmware?<br /><br />I&#39;ve updated the firmware to a MFW and it worked fine</span></p> <p><span></span></p> <p><span></span></p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/558679?ContentTypeID=1Wed, 14 Jan 2026 10:16:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4ca9c30e-7ade-4ed9-816a-891510ad6c64Benjamin<p>Hi Marcus,<br />The nRF9151 is shipped&nbsp;with the Production Test Image (PTI). It is not the regular MFW and it s<span>upports a subset of the standard&nbsp;AT commands for test purposes</span>. You will need to reprogram it.</p> <p><a href="https://docs.nordicsemi.com/bundle/ref_at_commands_nrf91x1/page/REF/at_commands/intro_nrf91x1.html">nRF91x1 Cellular AT Commands</a></p> <p><a href="https://docs.nordicsemi.com/bundle/ref_at_commands_pti/page/REF/at_commands/intro_pti.html">nRF91x1 Production Test AT Commands</a>&nbsp;<br /><br />Best regards,<br />Benjamin</p><div style="clear:both;"></div>