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Custom nRF52 board partially start

Hello, I just produced my custom board with nRF52 but i have a problem.

I can program it (SWD over nRF52 DK), debug it (segger debudder software) but in bootloader it enter in function ble_stack_init and never goes out.

Does someone have an idea what to check please ?

If external oscillator problem is a way to investigate, are they already on or nRF52 use an internal oscillator ?

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