update readme

Author: noahp

README.md

@@ -4,3 +4,75 @@ This repository contains tooling for building sample firmware images for
 nRF-Connect SDK quickstart. See more here:
 
 https://docs.memfault.com/docs/category/quickstart
+
+## Using the Payloads
+
+Find the latest release
+[here](https://github.com/memfault/memfault-ncs-quickstart-fw/releases/latest).
+Download the ZIP file for your board and extract it. You should find two folders
+inside, `0.0.1` and `0.0.2`, each containing assets for that firmware version.
+
+1. Flash the `0.0.1` image to your board using `nrfutil` or the nRF Connect
+   Programmer app. Note: flashing the `nrf54h20dk` is different, you'll need to
+   flash the 4 hex files separately.
+
+   ```bash
+   nrfutil device program --options chip_erase_mode=ERASE_ALL,reset=RESET_DEFAULT --firmware <path-to-extracted-folder>/0.0.1/merged.hex
+   ```
+
+2. Write the Memfault Project Key to the device: go to
+   https://app.memfault.com/organizations/-/projects/-/settings and copy the
+   project key. Then, use a serial terminal to connect to the board's virtual
+   COM port (baud rate 115200), and use this command to set the project key:
+
+    ```bash
+    uart:~$ config set_project_key <project-key>
+    Memfault project key saved to settings successfully
+    ```
+
+3. Create a `0.0.2` release in Memfault
+   [here](https://app.memfault.com/organizations/-/projects/-/releases?new), and
+   add the `0.0.2` payload:
+
+   - Name the release `0.0.2`
+   - When adding the payload ("Add OTA Payload to Release"):
+     - Hardware Version: this is the board name, eg `nrf54l15`. Use `mflt
+       get_device_info` in the serial terminal to confirm the value to use here:
+
+       ```bash
+       uart:~$ mflt get_device_info
+       [00:44:37.079,012] <inf> mflt: S/N: 59699E41B038
+       [00:44:37.079,045] <inf> mflt: SW type: app
+       [00:44:37.079,068] <inf> mflt: SW version: 0.0.1
+       [00:44:37.079,103] <inf> mflt: HW version: nrf54l15dk
+       ```
+
+     - Software Type: `app`
+     - The payload file to upload is `<path-to-extracted-folder>/0.0.2/dfu_application.zip`
+
+4. Deploy the release to the `default` cohort
+   [here](https://app.memfault.com/organizations/-/projects/-/cohorts).
+
+5. Install the nRF Connect Device Manager iOS or Android app:
+
+   - 🍎 [iOS - Apple App Store](https://apps.apple.com/no/app/nrf-connect-device-manager/id1519423539)
+
+     ![iOS QR Code](https://qr-generator.noahp.workers.dev/?url=https://apps.apple.com/no/app/nrf-connect-device-manager/id1519423539)
+
+   - 🤖 [Android - Google Play Store](https://play.google.com/store/apps/details?id=no.nordicsemi.android.nrfconnectdevicemanager)
+
+     ![Android QR Code](https://qr-generator.noahp.workers.dev/?url=https://play.google.com/store/apps/details?id=no.nordicsemi.android.nrfconnectdevicemanager)
+
+6. Use the nRF Connect Device Manager app to scan for and connect to your
+   device. Use the "Image" tab on the device page, select "Check for Update",
+   and "Download" to download the FOTA package.
+
+7. Once the download is complete, select "Start", "Confirm only" to install the
+   update. The app will upload the new image to the device, and it will restart.
+   You can see the new image version printed in the serial console when the
+   device restarts:
+
+   ```bash
+   I: Image version: v0.0.2
+   *** Booting My Application v0.0.2-fd967e4ec918 ***
+   ```