Programming nrf51822 beacon without to press sw1 button

[John]

Hello, I want to programm nrf51822 beacon using a samrtphone/tablet without to press sw1 button. Can I do this?If yes, how?

[Wojtek]

You should check this DFU FAQ, You will find answers there.

devzone.nordicsemi.com/.../

[John]

Thanks Wojtek! I fount this :"we can simply set a flag in GPREGRET and do a softreset (NVIC_SystemReset()) to get to the bootloader".But , I do not understand, how to make the Beacon know that must enter the DFU mode if another device wants to programm them?