Mastering FOTA: Step‑by‑Step Firmware Upgrade Process for LWM2M Devices

Firmware Upgrade Process

Firmware (the low‑level software that drives hardware) includes components such as BIOS on a computer motherboard. Firmware Over‑The‑Air (FOTA) enables OTA upgrades of devices that support the LWM2M protocol.

Detailed FOTA Workflow

Steps 1‑2: Upload the firmware package in the device‑management console and create an upgrade task on the console or application server.

Step 3: NB‑IoT devices report data, the platform detects the device is online and initiates the upgrade negotiation.

Steps 4‑5: The IoT platform queries the device’s current firmware version; if it matches the target version, the process ends, otherwise it proceeds.

Steps 6‑7: The platform retrieves the device’s cell ID, RSRP (Reference Signal Received Power) and SINR (Signal‑to‑Interference‑plus‑Noise Ratio) to assess signal coverage.

Step 8: If the query succeeds, the platform calculates the maximum concurrent upgrades based on signal strength (e.g., 50 devices when both RSRP and SINR are in level “0”, 10 devices for mixed levels, 1 device for weaker levels). If the query fails, the upgrade fails.

Step 9: The platform subscribes to the device’s firmware‑upgrade status.

Steps 10‑11: The platform sends the firmware package URL; the device downloads the package using chunked download and reports completion.

Steps 12‑13: The platform issues the upgrade command; the device performs the upgrade and reports the result.

Steps 14‑16: The platform queries the upgrade result, cancels the status subscription, and notifies the console/application server.

The Huawei Cloud IoT platform also provides a graphical console for one‑click upgrades of single or multiple devices.

Common Questions

Q: Can the target version be lower than the current version? A: Yes. If the versions are identical, the task is not started; otherwise, the upgrade proceeds.

Q: How to obtain the firmware package and its version? A: Obtain them from the module manufacturer.

Q: Will business processing be interrupted during a firmware upgrade? A: Yes. The module/chip cannot handle data reporting or property updates while upgrading.