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My Nokia 6120 is equipped with the A4 input method, but it cannot be installed. It says that the signature is wrong. How can I change the signature?

6120 is an S60V3.0 system! To install the A4 input method, you need to use your serial number to apply for a certificate! Then sign your software with the certificate before it can be installed! But now it is difficult to apply for a certificate by yourself. It is recommended to go to some mobile websites to see if there is anyone who can sign for you or apply for a certificate on your behalf! Recommend a signature agency website to you: / I hope it will be helpful to you!