2.download official android 2.3 firmware upgrade as image.bin file
3.format micro SD card with fat32
4.make sure you Zte Blade battery was not less then 50%
5.extract the image.rar file,you will see inside the file was having image folder just copy
the image folder with image.bin file to your root micro SD card.
6.install the micro SD card to your Zte Blade, off your devices then press and
hold(menu,volume+and power)button at same time.
7.your devices will show a bar at screen wait until the bar was run finish congratulation your devices
was success be upgrade from android 2.2 to android 2.3.