Since Saipan Certificate official website adjusted the policy of certificate production and restricted and changed the production process, the certificate production of various forums was forced to be suspended from June 22nd. No matter which forum website at home and abroad, under the current circumstances, it has been unable to provide users with certification services. Current solution: 1. For the software with low permission requirements, you can try to use Symbian mobile version of the direct signature tool v 1.2 1 to sign, but there is no guarantee that it will be effective, so you can only try. 2. You can crack the mobile phone, and you don't need a certificate signature to install any software after the phone is cracked.