When you're fighting ganon , he knocks away your master Sword. Then save the game and reset and then start the game again.
Now you should be able to use your Items on Epona.
Go to the Gerudo Valley and use your Hookshot on the sign with a circle, after that you will come off your hose and be floating.(This trick might not work)
If you need more help, we've got more Zelda 64: Ocarina of Time cheats and also check out all of the answers for this game
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