I've built the peripheral_uart project & it works on both the nRF52DK/nRF52832 & nRF52840DK/nRF52840
But if I enable bootlooder by adding "SB_CONFIG_BOOTLOADER_MCUBOOT=y" to sysbuild.conf it works on nRF52DK but not nRF52840DK
The bluetooth services does not appear on my iPhone running nRF Connect