Install X-plore or other file manager and free signature, which can be downloaded in Dangle. Apply for a certificate first, and you will get 1 Zip package when downloading. 265 batches are your signature. 265 batches were made. Feel free to go to the software page of 1 that needs to be signed, such as "calling firewall BlackBaller3.2". Then there is a prompt "This software needs to be signed, click here to download the signed software", just click in and download it. . Open x manager and unzip the zip package you just downloaded. There are two files XXX.cer and XXX.key after decompression. Remember where you unzipped them. Run free signature, and left-click Options-Settings. The two files of "signing certificate" and "signing key" are imported from XXX.cer and XXX.key that have just been applied for. Don't touch anything else. When signing, press OK to add tasks, find the software to be signed, and add! Left key-execute! Over. . I suggest you go to Dangle【S60 Fifth Edition Comprehensive Discussion Area], where there are graphic tutorials.