Well for one thing, that's what a factory reset does, delete everything on the phone. Including contacts.
Second, no there's no 100% free way to do what you want, and even the paid ones aren't 100% effective.
Also, if you downloaded anything or used the phone memory in any way after factory reset, your data could be pretty much irretrievable because the new data will overwrite the old data signatures, so recovery can't find them anymore.
Basically take it as a lesson to always backup up everything. One of the warning before proceeding with the factory reset was one that says everything will be deleted.
12-08-2016 03:56 AM