Nokia's mobile phone installation software needs software signature, and mobile phones need certificates to sign software. The certificate and signature software can be downloaded from Saipan Mobile Forum, and the certificate download service is accepted after 1 1 every day. Go all out. After the download is completed, insert the memory card into the computer, first click on the signature software and follow the prompts, then right-click on the certificate and "install the certificate". Right-click on the software you downloaded and just "sign this software".

In addition, in Tools-Settings-Applications-Program Management, set software installation to-All and online certificate checking to-Off. When installing the software, sometimes you will be reminded that the certificate has expired or hasn't arrived yet. Adjust the year and time of the mobile phone to the front point or the back point, then install the software, and then skip the time of the mobile phone after installation.

I don't know. Ask me.