I've read just about every post there is on the issues with the SSL VPN and the SPA525. I hate to bring up another post about this but, I was having stability issues as well with one of my clients.
This is a UC520 running the 15.1(2)T2 image. I have upgraded/downgraded phone loads. Currently, I'm running 7.4.9c-bt with the 2.5.3055 load of the SSL VPN.
I have the VPN stable now, however, the soft keys all say "In." They work as they would if they had the correct ephone-template. Does anyone have a fix for this? I've been banging myhead against the wall all day on this. If anyone has an answer please share.