First, you download these two softwares, then you decompress them, put them into your mobile phone, and install signs 1. You will see the corresponding icon signs 1 in my assistant. Next, the most important thing is to start the program SignSis 1. You will see three options: SIS KEY CERT SIS: add the file to be installed (press the box in the middle of the navigation KEY) key: select the decompressed key file (ditto) CERT: select the decompressed CERT file (ditto), and finally select the signature to get it done! ! ! ! 20-year life cycle download address: /display.aspx? RES _ id = 4 100703/resinfo . aspx？ res_id=4 100704