I just bought gen 2: mounted to wall and while hooking up I accidentally started my zones in the c,1,2,3, etc instead of 1,2,3. (Zone 1 was in C). I was able to take all out except the press in switch for zone 1 remained stuck. I was able to pull 01 wire out but the button is still stuck in.
Same issue sounds like you. Not sure why won't pop out. Would expect spring to pop button out but no dice.