Maybe a simple answer to a simple question but when downloading the latest firmware for the Cisco SPA525G / SPA525G2 phones the zip folder appears to contain two versions of the latest firmware file?
What is the difference between the two?
What would be the correct file for the SPA525G2?
That is correct. The BT has the upgraded bluetooth stack. They have two different firmwares to allow quicker upgrades for customers who do not have BT headsets.