I am the battery machine of V880+ 10 month. After brushing 2.3.7, it is very unstable. I lost weight, but the camera doesn't work well, and the shortcut keys for sending messages and making phone calls always fail. The address book is not backed up. It's all gone. I saw the following answer from hot7google today, so I tried it in official website. I downloaded "ZTE -U V880+" and it is no problem to monitor the network step by step. After the phone is turned off, there is still a problem connecting the phone to the computer. Why can't you connect? I didn't remember the button to enter the blue screen and prepare to brush the machine. I just entered a progress bar called Update from t-card-fend with "Press the menu button and volume button at the same time, and then press the power button". 100% will start automatically when it is finished. Then there is the endless sea, as shown below. Very thin. After a look, the system has become 2.3.5. Hehe, I put a 2.3.5 image.bin in the SD card before. This document was also found on the internet, and I attach it. These are the results of the picture below, slimming and refreshing.