How to Enable Auto-Sync in android using tasker's run shell action?

On my Gionee M3(MTK-6582) Auto-sync disables it self automatically. so i am trying to find a way to turn it on using tasker's run shell action.

I've already tried putting "ContentResolver.setMasterSyncAutomatically(true)" without quotation marks, in Tasker's Run Shell action. I did not work.

If there is a way to do it, then please guide me.

• create new task
• add an action
• select network
• select AutoSync
• set option to "on"