fix: fix nrf DFU by updating to new version

README.md

@@ -16,29 +16,62 @@ Firmware for Pinetime based on [Embassy](https://embassy.dev). The goal is to pr
 * Automatically synchronizes time with using BLE standard Current Time Service.
 * Rollback to previous firmware if reset or crashing before new firmware is validated in watch UI.
 * Compatible with existing InfiniTime bootloader.
-
-NOTE: Some features that has been removed after recent switch to mcuboot, but will be added again soon:
-
 * DFU: Implements Nordic DFU protocol so you can update from a phone app such as nRF Connect to perform firmware updates.
 
-
 ## Getting started
 
 If you have InfiniTime running already, it's easy to try out Watchful. You can use the same app you use to update InfiniTime to try out Watchful (such as GadgetBridge). 
 
 Pick the `watchful-dfu.zip` from the [latest release](https://github.com/lulf/watchful/releases) and upload it to your watch. To revert back to InfiniTime, head into the menu -> settings -> reset, and mcuboot will do the rest.
 
+To permanently mark Watchful as your OS, go to settings -> firmware and press `validate`. If you want to move back to InfiniTime later, you can use the DFU mechanism with the standard InfiniTime DFU image.
+
 ## Developing
 
 The recommended way to develop Watchful is to get a [PineTime Development Kit](https://pine64.com/product/pinetime-dev-kit/), to which you can connect a debug probe. For flashing and running with the debug probe, `probe-rs` is recommended.
 
-To run Watchful:
+
+### Running without MCUBoot
+
+While developing, running without the bootloader is the quickest way to iterate:
 
 ``` 4d
 cd firmware
 cargo run --release --features panic-probe,baremetal
 ```
 
+### Building an image
+
+To build an MCUBoot compatible image:
+
+```
+cd firmware
+cargo build --release
+cargo objcopy --release -- -O binary watchful.bin
+../tools/mcuboot/imgtool.py create --align 4 --version 1.0.0 --header-size 32 --slot-size 475136 --pad-header watchful.bin watchful-image.bin
+```
+
+You can also download the latest non-released image from the CI.
+
+### Flashing MCUBoot
+
+Flashing MCUBoot requires the mcuboot image:
+
+```
+probe-rs erase --chip nRF52832_xxAA
+probe-rs download tools/mcuboot/mcuboot.bin --binary-format Binary --chip nRF52832_xxAA
+```
+
+You can also build the MCUBoot image yourself from the [pinetime-mcuboot-bootloader](https://github.com/InfiniTimeOrg/pinetime-mcuboot-bootloader).
+
+### Flashing Watchful Image
+
+To flash the watchful image, use the artifact from your own build, CI or a release:
+
+```
+probe-rs download watchful-image.bin --binary-format Binary --base-address 0x8000 --chip nRF52832_xxAA
+```
+
 ## Recovering from older versions of Watchful
 
 NOTE: If you've used watchful before, it now has switched from using `embassy-boot` to `mcuboot` as provided by default on InfiniTime. To achieve that, the [nrf-softdevice](https://github.com/embassy-rs/nrf-softdevice/) has been replaced with [trouble](https://github.com/embassy-rs/trouble).