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Hello,

we have some D735 connected to SIP gateway. The phones have FW version 10.1.175.19 and HW version 4. Every time after a reboot, the phones try to download from MS provisioning another FW and then fail. Message "Validating firmware...checking hardware revision - HW rev. is not supported  by FW. - Device HW revision: 4 - Firmware HW revision: 3".

Skipping this message, the phones then work.

Does anyone have an idea how to fix this?

Thank you

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Andrea Pezzali

End user

Joined: 17.10.2025

1 Comment

  1. Snom Gianmaria Tononi

    Hi,

    Some specific hardware version for some of our devices may require a recent firmware to work as expected

    It may be that version 10.1.175.19, already on board this D735, is the minimum version required by the phone's hardware: if the platform is trying to downgrade the firmware that may not be possible, and that leads to the error

    I would suggest changing the FW version to 10.1.175.19 at least on the platform's side, so that this doesn't happen, or to remove the automatic firmware downgrade if that's not possible

    If you need to debug this further and you are a Snom partner, you can raise a private ticket so we can look into this

    Otherwise we recommend bringing this back to the reseller that installed the phones (likely a Snom partner), or talking with our sales team so they can direct you to a local Snom partner that may be able to help https://www.snom.com/en/contact/contact-person/

    Thank you