https://devzone.nordicsemi.com/f/nordic-q-a/127720/nrf54l15-ncs-3-2-3-secure-boot-chain-with-upgradable-mcuboot-fails-in-b0-nsib-validationHi, I am trying to set up a secure boot chain on nRF54L15dk with NCS 3.2.3 and an upgradable bootloader . My intended boot chain is: B0 / NSIB S0 / S1 for the second-stage bootloader ( MCUboot , so that MCUboot itself is upgradable) mcuboot_primaryen-USTelligent Community 13Wed, 08 Apr 2026 12:26:13 GMThttps://devzone.nordicsemi.com/thread/564619?ContentTypeID=1Wed, 08 Apr 2026 12:26:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f1210a3c-f72e-4451-82cc-8ab7a8a349b9Daniel01234<p><strong>EDIT: I resolved the issue:&nbsp;</strong></p> <p><span>At first, it looked like a key generation or provisioning problem, but the real root cause was my </span><code class="language-PlainText"><span>pm_static.yml</span></code><span>. I had placed the </span><code class="language-PlainText"><span>provision</span></code><span> partition in </span><code class="language-PlainText"><span>flash_primary</span></code><span>, while the working Nordic layout expects it in the </span><code class="language-PlainText"><span>otp</span></code><span> region for this setup. Because of that, B0/NSIB effectively read invalid or erased values like </span><code class="language-PlainText"><span>0xFFFF</span></code><span> from the provisioned data and rejected the images. After adjusting the partition layout to match the correctly generated one, the bootloader chain worked as expected.</span></p> <ul class=""><!--ScriptorEndFragment--></ul><div style="clear:both;"></div>