Application does not run after adding DFU (MCU BOOT)

Hello Team,

We are working on custom board using nrf54l15 platform.

If we flash only application code, it works, LED is blinking & BLE advertises. But after adding DFU(MCU boot) support, it does not work.

We have already checked following post
Enabling MCUBOOT does not run application - Nordic Q&A - Nordic DevZone - Nordic DevZone

But in our custom board, crystal is mounted. 

Kindly guide us on this to resolve.

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