Reboot to DFU?

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Ivor
I've not tried/done it from espruino... but in my nrf code the steps to get to DFU are:
1. disable softdevice
2. disable interrupts (NVIC->ICER & NVIC->ICPR [0&1] = 0xffffffff)
3. write 0x57 into GPREGRET
4. call NVIC_SystemReset()

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