TEST-X
2026.06.04: Firmware update safety mechanism in FOTA Web
We would like to inform you about an upcoming improvement in the FOTA WEB system, designed to enhance the safety and reliability of firmware updates for the devices.
| Change description | ||
|---|---|---|
| Change type | Firmware update safety mechanism | |
| Detailed description | We are introducing a new safety mechanism in FOTA WEB that prevents firmware updates from being executed on devices running an outdated bootloader version. This helps eliminate the risk of device malfunction during update procedures. | |
| Required bootloader version: Minimum required: 65.0E (displayed as 101.14 in FOTA Web). Devices with an older version must first apply a bootloader patch before updating to newer firmware. |
Recommended update path: Any firmware → FM65.Ver.03.01.00.Rev.28 → (if required) FM65.Ver.03.01.00.Rev.34_1666 → FM65.Ver.03.01.01.Rev.15 or newer | |
| Change reasons | Certain newer firmware versions, such as FM65.Ver.03.01.01.Rev.15 and later, exceed 1 MB in size. Devices with older bootloader versions may not support these updates safely. The new mechanism ensures that such updates are only performed when the device meets the required bootloader conditions. | |
| Safety mechanism launch date | Jun 15, 2026 | |
| Affected products | ||
|---|---|---|
| Model | Affected order codes | Order code changes |
| FMC650 | All order codes | - |
| Change impact | ||
|---|---|---|
| Risk assessment | The bootloader patch firmware (Rev.34_1666) is an intermediate step and not a full firmware version. Using it as a standalone firmware may lead to limited functionality or unexpected behavior.
Starting from version 03.01.00.Rev.28, devices automatically block firmware updates if the bootloader is too old. This protection significantly reduces the risk of bricking. | |
| Suggested implementation plan | Only a limited number of devices require a bootloader update. We recommend avoiding unnecessary bootloader updates. To ensure a smooth and safe firmware update process, please follow the recommended update path sequence provided in the Change description. | |
| Acknowledgement of PCN receipt | ||
|---|---|---|
| If no feedback is received within two weeks after the issue date of this notification - Teltonika may accept that this change has been tacitly accepted and can implement the change as indicated above |