Jumping to Bootloader from the Application

[rabiaasl]

How can I jump to the bootloader from the application without anything BLE related. Possibly through a botton?

I'm on the newest SDK v11.

[rabiaasl]

What would happen if I set the GPREGRET and turn off the device? Will the GPREGRET still retain the data when the device starts up again?

[bjorn-spockeli]

No, the GPREGRET register will not be retained during a Power-on-Reset. Pleas refer section 12.1.19 Reset behavior in the nRF51 Reference Manual, found here.