Step 4: Build and flash

Important

west flash --recover and nrfutil device recover erase the whole chip, including the device credentials you install in step 5. Use them only for the first flash. After you have installed credentials, re-flash with a plain west flash, or with nrfutil device program without the recover command, to keep them.

Flash the host firmware. Choose one of the following options:
- Build from source: Run the following commands inside the toolchain shell (step 2.4 in Set up the repository and toolchain), from smha-workspace/project:
```
cd applications/ppp
west build -b nrf93m1dk/nrf54l15/cpuapp/ns -p
west flash --recover
```
- Pre-built firmware: Download the ppp-nrf93m1-* zip from the latest release, extract it, and flash merged.hex. See Release artifacts for what the zip contains.
```
nrfutil device recover --serial-number <dk_serial_number>
nrfutil device program --firmware merged.hex --serial-number <dk_serial_number>
nrfutil device reset --serial-number <dk_serial_number>
```
Open a serial terminal at 115200 baud on VCOM0 and reset the DK.
Note the Device ID in the boot log. You need it in step 5:
```
<inf> nrf_cloud_info: Device ID: <16-hex-device-id>
```
This 16-character hex ID comes from the nRF54L15 hardware ID. It is not the modem UUID.
Wait for the PPP link through the modem to come up.

Checkpoint: The console logs the following:

<inf> main: Network connected