How to recover the SMS backed up by AISI assistant?

① Please change the suffix of Msg.i4c to zip, and then extract it to get a database file of sms.db, which is the file where Apple stores short messages. ② Open itunes, and after upgrading this system to 8.4, use manual backup and recovery to back up the iphone. ③ Open itools, select itunes backup management, open the backup that just used tunes, enter the directory /var/mobile/Library/SMS/, and then replace sms.db with the database file extracted in the first step. ④ Restore directly with itunes, and the SMS has been restored.