When power on,run app first at 0x1f000,then reset and run to boot loader,how to set UICR registers?

[sheep]

When power on,run app first at 0x1f000,then reset and run to boot loader at 0x78000,how to set UICR registers to make this come true?I try to set the NRF_UICR->NRFFW[0] in the app and then NVIC_SystemReset(),it doesn't work.How can I set the start addr of program in the app?Thank you~

[Hung Bui]

@sheep: we can continue discussion on the other case you created devzone.nordicsemi.com/.../