I had to dig for an explanation - so instead of leaving the topic buried, thought I'd throw out a new one to cover this.
If you have the MSN tuner, and do the Z130 upgrade, you will end up with an annoying, slightly unusable HU...
After the update, if you have not pulled your HU out, and unplugged the MSN (i you have it), you will get a "
tuner error - if this persists, contact Pioneer".
Everything still works, and you can use the nav/radio et al - you just have to press "OK" every few seconds (hassle) when trying to use the touch interface.
Funny that they would not have thought about this with the upgrade (???????????????????????????)????????