mobile

Hi, last September I bought an unbranded Chinese android 4.2.2 car entertainment gps, dvd radio Zhong Xing model 2505, they delay the shipment on account they had bugs, 2 weeks later they told me they were ready to ship and bugs were fix , (did receive the unit mid-October). That was not the case. Been talking trough AliExpress I have send many Emails up to mid-December got some answers like (will refer to our engineers and will get back to you) still waiting for right answers. Since my car is a cabriolet I put it in storage for the winter, got it off storage the first week of April, now that I have my car at home I have been trying to fix some bugs, I fix the backup camera that was upside down, USB (2) port not working check if it has power both port have the 5 and 0 volts and are charging USB device, also the front phone button when click get me to the radio window screen instead to the phone window screen. For the USBs I don’t know if it’s a driver problem or a config problem, been trying to access the Developer Options menu by tapping 7 times on the build number but nothing give. Is there some hidden menu in Android, if someone can shed light I would be thankful. This is the head unit that I bought.
BRAND NAME : ZHONG XING
MODEL NUMBER : 2505
Thank you

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