ive found this in directions in some chienies site with google tranlate:1, unpack / pack U880 bin file
If you cannot click the button it's because the pc is not detecting your zte correctly. A friend flashed it for me and as far as I remember he had the same problem and solve it by modifying the .bin file with the imei number of the phone. I don't know how he did it, I'm sorry I cannot give you more specific details.
2, modify the partition size of the package
3, when the unlocked bootloader package access permissions and ramdisk (ramdisk permission applies only to version 2.3 bin)
4, convert bmp file to logo.img file
How to use:
1, the bin file to program the same directory, rename U880.bin
2, select the corresponding version of the bin file
3, click on "unpack U880.bin" button, extracted from the bin logo.img, ramdisk.img, recovery.img, system.img, data.img file
4 (Optional) Modify the partition size and other options??
5 (Optional) Click the "Generate logo.img" button to select the bmp file or bmp file drag the button to generate a new logo.img file to modify
6 (Optional) Modify the partition contents of the file, such as the replacement recovery, modify system.img, then replace the img file under the program directory, or check the "custom partition data" after setting the new img files
7, click on "packaged U880.new.bin" button, according to the relevant options and the corresponding img file read U880.bin repackage U880.new.bin file