Fanvil x5s firmware upgrade 1.12.8 sip register failed

[ixna]

Our 3cx phone system has been running for about a year now with no major problems.
We have 5 different sites with 1 of them being the main one that runs the 3cx software.

However recently I upgraded the handsets as requested by the 3cx software to the latest supported version 1.12.8. (From 1.12.5)
At 1 of our external sites (which is connected using air fiber units over a 7km link) we have 5 Fanvil x5s handsets. All 5 upgraded successfully but only 1 is working properly.
In the 3cx software all phones show up fine and connected. However on the handsets that dont work I get the message 'Sip register failed'. The BSS numbers show up in the list but no lights come on next to them. Occasionally the sip register messages goes away and shows that its working. A call starts to get made but times out and then the sip register message flashes again.

I have factory reset the phones. I have now replaced one of the non working handsets with a spare I had running an old version. It registers and works fine.

All this leads me to believe that something has changed in the new firmware to how the phones are registering for SIP. My firewall rules havent changed or any network gear that I know of.
If anyone has any ideas on what to try or even how to downgrade the firmware easily please let me know ASAP

Thanks

 

[ixna]

So I've also tried manually downgrading the firmware using the web interface of an affected handset. I select the firmware to downgrade to and click 'upgrade'. The page briefly does something and then displays 'The connection was reset' and I have to refresh the page before I can keep doing anything.

Any ideas?

 

[JohnS_3CX]

Hi @ixna

Best to start from here: https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

Don't forget to include details of how you are set up networking-wise. That's the main thing that would affect registrations

 

[ixna]

Hi @ixna

Best to start from here: https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

Don't forget to include details of how you are set up networking-wise. That's the main thing that would affect registrations

Hello

The only detail I can see that I missed was:

Latest stable version of 3cx. (We have an active subscription)

The phones connect using the lan IP on a different subnet at our main site.

I've just now had reports of handsets failing at our other sites too. Definitely is firmware related.

Can anyone help me with how to downgrade the firmware as I keep hitting the problem as I posted above?