1. What is a certificate and why should I sign it? A: The third edition of S60 operating system has increased the security of third-party software installation and operation, and some operations involving mobile phone software, hardware security and personal information security are particularly restricted. Some software, such as self-starting software (incoming call), must be signed before it can be installed and run in order to realize these "specially restricted" functions, but to sign the software, you must have your own certificate file to realize this operation, that is to say, someone must be responsible for the security of this operation! A program without any signature cannot be installed and run. 2. What is a "sign"? A: It means writing the certificate content into a specific field of the application with a special tool, which means that the software has passed the audit of the signer. The signer is responsible for the security of the software. 3. Why is there a "security warning" when installing some unsigned software? Will direct installation affect the mobile phone? A: No, some signature-free software will prompt "security warning" when installing. Just ignore the installation. This is because the author has signed the software with a public free certificate when developing. These softwares can be installed and used directly, but some functions that are restricted for security reasons will be lost, such as the self-starting function of "incoming call"; 4. Can my certificate file sign the software that others want to install? A: No, because the personal certificate file is bound to the serial number of your mobile phone, which means that a serial number corresponds to a certificate file. Even if your signature is successful, you can't install it for others; 5. How to install some software or theme phones and prompt "Certificate expired, certificate is not effective"? Answer: This problem is easy to solve. Set the time of your mobile phone system back to half a year. If it is impossible, adjust for another six months, but don't overdo it. Otherwise, the certificate will not take effect. Just adjust the phone time back after installation, and the operation of the software will not be affected by changing the time. Address:/Please come to the certification station every morning 10 to afternoon 1. You don't need any qualifications, just leave the IMEI, and the IMEI registered on that day can be used the next day. How to sign: 1 First, you unzip the signature tool. Open the decompression tool at 2: 00. 3. Put the mouse on the certificate and press the Back key to select Import Certificate. Click the right mouse button on the software to be signed, and select to sign the file. 5. There will be 1 and 2 for you to choose from, and then press Enter 6 to automatically generate a folder named "Signed". . . (Here is the name of your certificate) "7 Take the files in the generated folder to your mobile phone for installation (the signature is successful).