Evasi0n is untethered jailbreak tool for all devices running iOS 6 and 6.1, including iPhone 5 and it is  the easiest way to jailbreak your iOS device but few people are facing a “lockdown” error message when they try to jailbreak their device. You may get errors like

  • Could not connect to lockdown (-3)
  • Failed to connect to lockdownd (-12)

Though the reason for the issue is unknown, the fix for both is the same! Simply open up the Settings app and navigate to General > Reset, then tap “Erase All Content and Settings”.

Update: Dean Newman says that he was able to fix it with a settings reset only, not a full reset. No data was lost.( please refer in comments section for more info or give a reply to his comment).

After that, if you already have evasi0n running on your desktop, exit and restart it. Currently, jailbreaking iOS 6.1 using evasi0n breaks the stock Weather app. Team evad3rs member pod2g has identified the issue and has stated that a fix for it is on the way.

Before you do it though, please note that this fix requires you to perform a complete factory reset of your iOS device. So it is recommend to backup all the required files/Photos/Videos etc.