https://devzone.nordicsemi.com/f/nordic-q-a/94876/can-t-update-mcuboot-flash-protectedI&#39;m trying to update MCUboot from the application. As a first test, I enabled the flash shell commands. I can erase somewhere within the flash without problems: uart:~$ flash erase e0000 1000 Erase success. but when I try to erase the bootloader,en-USTelligent Community 13Thu, 15 Dec 2022 13:31:08 GMThttps://devzone.nordicsemi.com/thread/400848?ContentTypeID=1Thu, 15 Dec 2022 13:31:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d5d09a8-e13f-4a0d-8024-c1b48b63bb2cVidar Berg<p>Hello,</p> <p>I am afraid you will not be able to update the bootloader in your case. The flash protection is one thing (can only be disabled through a reset), but it is also unsafe to delete the bootloader while running the application. Any unexpected during the update&nbsp;would &quot;brick&quot; the device as the bootloader will be the first entry point after reset (assuming it starts at address 0x0).</p> <p>MCUboot must be implemented as a second stage bootloader if you want to make it upgradable:&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bootloader/README.html">https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bootloader/README.html</a>&nbsp;</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/400735?ContentTypeID=1Thu, 15 Dec 2022 02:51:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:acb7ea04-21b2-45d1-9cec-a8be49761fc0frankbuss<p>I think I found the problem:&nbsp;CONFIG_FPROTECT=y is set for MCUboot. This in turn sets the SPU flashregion registers for the MCUboot range, and also locks the registers. So I guess there is no way to unlock it from the application, without using an external programmer?</p><div style="clear:both;"></div>