pebble-firmware/docs/development/prf.md

PRF

PRF (Pebble Recovery Firmware) is a special firmware image available for recovery purposes. It allows connecting from a phone to, for example, flash a new firmware image even if the main firmware is broken or unavailable.

Building

Once a project is configured, PRF image can be built by running:

./waf build_prf

Flashing

The PRF image can be flashed directly into the application area by running:

./waf flash_prf

This is useful when developing PRF features because the watch will boot directly to PRF. To flash it to the external flash, so it can be used regularly, run:

./waf image_recovery

Append --tty option if needed. In such case, PRF will need to be copied to the main flash to run. This can be done by pressing {kbd}BACK + {kbd}UP + {kbd}MIDDLE when booting, or holding {kbd}BACK for 7-10s while in the main application.

Console

You can interact with PRF console by running:

./waf console_prf