if i want to relock and send mack my iphone to apple

[SMkdesigns]

should i boot nutuer it and put the baseband to off unlcok. what about the boot loader what should that be at.

Ater i do that then i should load the iphone firmware correct

[TheConfuzed1]

Why are you sending them back?

If you are expecting warranty work, or a refund, you need to put your iPhone back to a restored condition.

What your "mack" has to do with this, I'm not sure. ;)

[SMkdesigns]

if i send my phone to apple and they cannot fix it and its under apple care wil they give me an iphone 3g or a second generation like i had

[TheConfuzed1]

They will probably send you a refurbished 2G phone.