wanting to reset iphone 3g with ios 4.1 with baseband updated to 6.15
I have an iphone 3g 16 gig that is running on ios 4.1 which was jailbroken on redsnow 0.9.6b6. it has the ipad 6.15 baseband version installed so it could be unlocked by ultrasnow (no official sim card available). Sam was also installed to avoid any battery issues.
I am wanting to sell it but i am wanting to erase any personal information off of it. ordinarily i would just do an erase all content and settings but since the iphone was updated to baseband 6.15 a restore to official software wont work.
My question is how do i do it. Can i restore to custom firmware using snowbreeze and hacktivating it. then install sam. and then ultrasnow. or can i just rerun redsnow without doing an erase all content and settings. and reinstall ultrasnow and sam. or is there an easier way to do it.
please let me know