Specifically for the t42s but I’ve noticed that at least a few other models have outdated firmware as well. I bought a couple of t42s phones with the hope of getting them on the wifi at a customer that has no structured wiring. What I’ve learned so far is this for the t42s model:
-The latest level in EPM (labeled 1.17) 188.8.131.52 does not support wifi
-The level that came loaded on the phone i just bought 184.108.40.206 does work
-I was told on the Yealink forum that everything as of 220.127.116.11 does work for the t42s but as pointed out above this isn’t quite accurate.
-The latest level on the Yealink site is 18.104.22.168