Downgrading brand new V65 to 3cx compatible firmware, but how did we do it!?

[COIT]

We've just bought a bunch of new v65s, a recommended by 3cx, supported router phone.

The phones come with a firmware that is later than the current 3cx supported firmware and we'd like to downgrade them to the 3cx supported version.

Due to the downgrade lock we're not able do the downgrade via the phone web interface so we've been tried to do it by booting the phones to post mode. Unfortunately that's still not working because of the downgrade lock.

We tried setting up a tftp server but that doesn't seem to be supported.

We also tried via usb but still now further forward.

So we hit a bit of a road block, or so we thought....

Randomly, whilst booting to post mode for the umpteenth time, the phone came up saying 'recovery mode'. We then connected to the phone via the web interface, again as we'd done many times before, but this time the web interface was different (a more sparse interface), and from there we were able to upload the 3cx supported firmware and complete the downgrade.

The problem is, how did we get into 'recovery mode', we simply don't know what we did differently!?

Just to prove we weren't going mad, here's a screen shot of the phone in recovery mode.


Any ideas?

 

[NikolasA_3CX]

Hi @COIT

For this, it would be better if you contact the vendor and check with them what the process of downgrading the firmware is, or how to get into recovery mode.

Also you may need to check the phone's manual for any info on how to get into recovery mode.

 

[JohnS_3CX]

Any ideas?

A certain building block shape comes to mind.



But in all seriousness, this lock is not to be taken lightly - newer batches may have a different flash chip or SoC and you might end up destroying your shiny new phones permanently. Recovery Mode on phones is usually a simple flash writer, it might not have any guardrails to prevent the user from doing something catastrophic, and expects the correct file to be used.

Run them on the current unsupported firmware (since you don't have much of a choice now) and later on, the supported version will catch up / supercede the one you have now in a safer manner.

 

[Kevin Attard Compagno]

I suppose one question might be: what is IP Address 192.168.1.179 ?

 

[COIT]

A certain building block shape comes to mind.

View attachment 50999

But in all seriousness, this lock is not to be taken lightly - newer batches may have a different flash chip or SoC and you might end up destroying your shiny new phones permanently. Recovery Mode on phones is usually a simple flash writer, it might not have any guardrails to prevent the user from doing something catastrophic, and expects the correct file to be used.

Run them on the current unsupported firmware (since you don't have much of a choice now) and later on, the supported version will catch up / supercede the one you have now in a safer manner.

In that case we'll just run with later firmware.