change factory radio stations

hello, i installed an android car radio which has an RK3066 inside an runs on android 4.4.2 now i installed the radio and everything worked fine until i let my car for more than 3 days. my car battery was fully drained. and this happend me more than ones, i contacted the suplier and he said i need to place an relay to turn of the radio when i turn of ignition, now ive done that and everything is working but everytime i shutdown my car the radio stations are lost and set to factory defaults, is there a possible way to change the factory defaults of the radio. the link shown below where i bought the radio.


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via xda-developers http://ift.tt/1OxZqnB

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