Need to wipe jailbroken ipad 1 and sell with jailbreak

Hi gang. I am on 5.0.1 untethered jailbreak. I have a buyer for this ipad 1 however of course i want to wipe all my info off of it and rejailbreak

I see i can just restore to 5.1 and do a tethered jailbreak however is there a way to restore to 5.0.1 and rejailbreak untethered?

Please help!

 

according to dev team old idevices can downgrade to iOS5.0.1 if you save SHSH blobs.. you need to try back and i already do and its work..

 

I have my blobs saved...but do i need to downgrade since im already on 5.0.1?