I have an iphone 4s 6.1.2 jailbroken using evasi0n(older version). Is it ok to jailbreak it again without upgrading to 6.1.3 but using the latest version of evasi0n? Please advise of any cons in doing so because I don't want to brick my phone. How about using another tool? Please suggest if it is possible. Thank you. NOTE: Speakerphone works perfectly but no sound when playing music.