Here it is. Put the save in the directory C:\Users\(username)\Powersaves3DS
First, back up your save if you want to.
Then, delete all save data on OoT (Boot up OoT3D while holding A,B,X,Y at the same time until dialog pops up)
Finally, use Powersaves to restore the save I've provided you.
Load up the save (it should be under Slot 3), and interact with the game in anyway (open the items menu. I personally have had 100% success booting up the exploit doing that).
Please note that OoT3DHax does not work with Hax 2.5. I recommend installing menuhax with the new menuhax manager 2.0. It downloads the 2.5 payload straight from Smea's github.io.
Download:
https://www.mediafire.com/?3onn2t334dn6t6t
If this works, I will make other saves for others
Edit: Make sure you have boot.3dsx and the 3ds directory on the root of your sd card. (download these from here:
https://smealum.github.io/ninjhax2/starter.zip)