I am dealing with an issue of the pioneer AVICZ110BT not showing phone book information for only a portion of the letters. When trying to access the phonebook, letters G-Z will not come up unless a hard reset is done to the unit and even when the unit is reset, the same issue occurs once the car has been turned off and back on. It is very frustrating! Any ideas? Please help!

I get that too, I have a phone book that showed up in its entirety when I got the phone. Phone broke, I replaced it, I authorized to the H/U again and it only displayes about 17 of the 200 entries now.

Reset the unit and re-pair the phone.