How to Securely Erase Your iPhone Before Resale
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Wipe iphone 4 system clean E-mail 此主題給朋友 [按此打開] [隱藏] Iphone 4 16g, with Limera1n jailbroken, 4.1. I tried to wipe the whole file system clean by writing zeroing data, but encountered the following problem: I successfully sshed into the device, and force the two partitions (root partition and media partition) to read only mode, but have to unmount the media partition before doing that. So when typing the following command "umount -f /private/var" the system returns the error with "not a directory or special device" So anyone knows what's the cause? Thank you

I get "Killed" after entering "umount -f /private/var" command and "mount_hfs: Resource busy" after entering "mount -o ro /private/var" iPhone 2G OS v3.1.2 Jailbroken/Unlocked

Does this work on windows? And it's like this that the iPod on my iPhone have for no special reason disappeared, do I get it back if I restore using iTunes?

DAVO YOU NEED TO CONNECT IT TO UR PC AND DO THIS:...TRY TO JAIL BREAK IT WITH A DIFFERENT FIRMWARE THEN WHAT YOU NOW HAVE ON YOUR IPHONE BY DOING THIS YOU SCRAMBLE UP YOUR OWN FIRMWARE AND ALL WILL BE WIPED CLEAN THEN YOU DO A COMPLETE RESTORE LEAVING YOU AND ALL YOUR DIRECTORIES CLEAN AS A BABYS ASS

Hey, Good stuff. Just curious: Anyone trying this with 2.1 firmware? When I run umount I receive "Killed" immediately. Doesn't seem to be working. I thought maybe there was an updated version of umount in the 2.1 build, but I can't find it anywhere. Any thoughts? Maybe this is no longer necessary due to the new erase features in 2.1? Thanks.

I'm getting the exact same error, been searching all night. Have you found any other info? Maybe editing fstab?

wow, seriously dont try it! if you dont know that you have to run "ldid -S /sbin/umount" then you probably shouldnt be messeing around with your iphone. Becuase the CIA dosent want to retrive your data off your old iphone this is completely unnessecary.

Hey, thanks for putting this up. I read through Zdziarski's post, but I'm not entirely familiar with Terminal and was a little edgy about carrying it out, worried that I might make some changes to my Mac accidentally. Great work here, much appreciated.

How about a windows version?

Yeah, kinda like a Speak & Spell voice :D BTW, very good tutorial ! :)

You sound like a broken record in the terminal cat part haha :)