My wife gave my her friends tablet which had a whole bunch of rubbish on it including a message across the screen saying "DEMO" in big red letters. They were going to throw it away after spending many hours trying to fix it.
A quick look at the tablet and I could see right away that it was not exactly a top of the range device from a major brand seller so finding information was going to be a bit tricky. My first thought was to try and restore the device back to its factory settings.
Factory restore worked but sadly it did not remove any of the rubbish and the big red "DEMO" sign was still displayed. A look in the "About Tablet" section under "Settings" showed my the:
- Build Number: polaris_a70H-eng 4.2.2 JDQ39 20140322 test keys
- Processor: DualCore - A23
I spent a while on Google looking for these details and my issue and eventually found this:
http://forum.gsmhosting.com/vbb/f906/need-firmware-gt90h-allwinner-a23-1832944/
On this forum I read that I could download the stock firmware for the device here:
http://www.mediafire.com/download/8azlmumhx7s1md1/GT90h_v2.0_800x480-google.rar
(This download is a bit slow but it worked)
and that I could use the "PheonixSuit" to load the firmware to the device which can be downloaded from here: http://androidxda.com/use-phoenix-suit-flash-firmware
After downloading the software to my Windows 7 PC I tried to connect the tablet. This gave me quite a few issues. Windows would not recognise the device and even though I had it connected and debugging enabled the "PheonixSuit" kept saying:
I tried downloading the: http://www.kingoapp.com/android-root.htm as this application suggested that it could automatically find the drivers that I needed. It did find the drivers and was able to connect to my friends device. I discovered from this application that my friend had previously rooted the device. I chose to then close this software and attempted to open the "PheonixSuit" again. This time I had a bit more luck...
Now I was able to click the Firmware tab in the "PheonixSuit" application and browse to the stock Firmware that I had downloaded earlier on. Simply clicking the upgrade option then delivered a clean Android installation to the tablet and presto! everything good as new.
It was a bit of a pain but worth the messing around.
