Due to the Chinese Labor Day holiday, The rockchip company delay to release the offical Android 4.2 update on the RK3188 tv sticks, During this waiting time, Our friends in Armtvtech has made an step by step instruction for how to downgrade the Tronsmart T428 to Android 4.1. Some user report after flash to Android 4.1, the Antutu socre can reach 19000. wow
So here is the firmware download link
This firmware already rooted and has 2GB data partition.
1)Download and extract the firmware on your pc.
2)Navigate to the extracted firmware and launch “RKAndroidTool.exe”
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3)Change the following:
-Double click on “..\rockdev\RK3188Loader(L)_V1.00.bin” and change it to “.\rockdev\RK3188Loader(L)_V1.04.bin”
-Double click on each of the other entries and remove the extra “.” before \rockdev\
Example: “..\rockdev\parameter” becomes “.\rockdev\parameter”
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4)Hold down Upgrade button located on the side of the T428 while plugging it into your pc.
If you already have drivers installed you will see the screen change to “Found RKAndroid Loader Rock Usb”
If not you may have to install the drivers located in the “RockusbDriver” folder.
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5)Click on the “Run” button. A popup window will come up stating “Parameter was modified, do you want to reload?”
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6)The firmware will begin to flash.
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7)The firmware has successfully flashed. You can exit the program now.
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The T428 will now reboot, format /data/, /cache/, and /sdcard/.
It will then reboot into 4.1.1(This can take a few minutes the first time)