Download an install android adb drivers from here
Extract the contents of the ROM.
Boot your device into fastboot mode
To boot to fastbot mode, remove battery, hold volume down button and connect the device to your computer,
release the volume down button about 5 secs after the logo is displayed.
Launch Android AIO flasher.exe
click Select file( browse and select the boot.img file)
Wait till you see "writing boot...OK" before you know boot.img is flashed to the device.
Now you will have to flash sys.yaffs2.img file.
click Select file( browse and select the sys.yaffs2.img file)
Wait till you see "writing sys.yaffs2.img OK" before you know boot.img is flashed to the device.
This process can take about 2 mins.
Disconnect device from computer.
While holding volume-up connect it back to the computer.
keep holding volume up till you enter the Android 3e stock recovery menu.
using volume up and down to move
select "wipe cache", PRESS power button to select
Select "wipe data/factory reset"