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BLE example not working on external target

Hello,

I have a custom board with a Taiyo Yuden chip (it integrates an nRF51822 QFAC chip, 2 crystals and the BLE antenna).

I program it using SWD. I succesfully uploaded code to this board, blinking leds and logging over RTT. I programmed a softdevice on it using nRF Go Studio (S130).

The BLE UART example works fine on the Development Kit, however when I try to run it on my custom pcb it doesn't work (upload successful but no BLE peripherial visible).

What can be the issue ?

Louis