This is  Android 4.2 car stereo use manual, If you don’t know how to set the car stereo at the first time, please down load it, and follow the use manual do it step by step. Please note It’s only fit for the Pumpkin Android powered Car Stereo system.

In the process of using, you may be meet FM/AM Radio doesn’t your country channel, like this problem:
AM radio seems to be tuning for euro channel spacing.
How do I change the regional settings for North America?
so how to solve it?
The SKU have include this GS, JY and KD, the UI like

You can do it like this steps:
First, open setting, click factory settings.

Second, enter password word:126

Third, find radio band and change the channel America1 or America2, then click apply