Softphone won't dial out in CTI mode after T33G Firmware Update

[SupportRock]

We have a load of new T33G's and all are working fine except for two. The only two that had firmware updates applied to them through the 3CX Console.

Out of the box they had 124.86.0.158 and all these work fine and dial out from the softphone both in Softphone & CTI modes.

The only two we upgraded the Firmwares on were from 124.86.0.158 to 124.87.0.20 and now only dial out in Softphone mode but not in CTI mode.

I've tried to manually apply the previous firmware to see if this is the issue but it fails with a softwware limit issue.

Has anyone had anything similar before or know how we can re-apply the previous firmware?

 

[SupportRock]

Been doing some digging and might be an issue going back from 87 to 86 it seems.
I've managed to go back from 124.87.0.20 to 124.87.0.15 but that doesn't seem to have helped with the issue.

Wondering if there is any reason 87 doesn't work and what could be different between 87 and 86 to stop it dialing out on the softphone when in CTI mode. I'm guessing the softphone is not linking to the deskphone in some way.

Not sure how you confirm if the softphone is linking to the deskphone OK when you switch it to CTI mode?