I'm looking for new firmware for the SPA 504, 502, 509 phones. (currently 7.1.3)
They were delivered with firmware version 7.1.3. However I never found were to download this firmware or newer firmware for them.
I was only able to download firmware for the SPA 525, which as far as I understand cannot be uploaded to the previously mentioned models.
In other forum posts I've read that this models are the same as SPA9xx. However when downloading firmware for SPA9xx phones, the newest firmware version number is 6.1.5. This looks to me like an older firmware build that the one currently used (7.1.3). Also I'm not sure if I can go ahead and upload SPA9xx firmware on SPA50x phones, since I have no acces to the currently used firmware (to make a rollback in case things go wrong).
Any help is greatly apreciated:)