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usb dfu bootloader with GPREGRET entrance Cause cannot get out the bootloader mode

hi,

I am working with usb dfu bootloader for nrf52833. I set the bootloader entrance mode to GPREGRET only. before enter bootloader, I set NRF_POWER->GPREGRET = 0x00000001, and I can enter the bootloader mode without problems. but after timeout reboot and flash finished reboot, the chip does not switch to application mode, it stay in bootloader mode. but it works for nrf52832. I know GPREGRET will reset when power off, but in my case, I cannot do that. is there any way I can get out of bootloader mode?

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