NRF programmer app not flashing a custom board even when in bootloader with mcuboot enabled.

1. Description and how to recreate it


Im attempting to flash a custom board with a nrf5340 on board using mcuboot via nrf Programmer v4.5.0. 

When I put the board in bootloader mode it tells me that No operation possible.

I saw a post from about 4 years ago saying that this is not possible to use this application to flash custom boards, is this still true?

2. Development Setup 

OS: Ubuntu 24.04.1 LTS

SW: versions

nrf-Programmer v4.5.0

nrf-connect.sdk:2.7.0

nrf-connect.toolchain:2.7.0

Zephyr-sdk using provided from nrf-connect

HW: versions

nrf7002-QFAAAA

nRF5340-CLAA

nPM1300-QEAAB0

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