Default [Q] 2 DIN Pure Android 4.1

Hello,

I'm new here in this forum... keep it on

I have this 2DIN system:

http://www.ebay.com/itm/Android-4-1-...item3ce14c0e5a

After I have rest this unit by the code "7890" my 2din system didn't save FM stations. When I turn it off then on all the FM stations go back to 87.5 MHZ.

How can I fix it?

Thank's for you helping!
Phone: Sony Xperia Z2
Rom:
OS: Android 4.4.2 (KitKat)
SD Card: 64 GB

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Phone History: Motorola StarTac ST7867W ---> Sagem my X2 ---> Nokia 6131 ---> Nokia N73 ---> Nokia 6290 ---> HTC HD2 ---> Samsung GT-S5620B ---> HTC ONE X ---> Sony Xperia Z2