The iPhone Wiki is no longer updated. Visit this article on The Apple Wiki for current information. |
Restore Ramdisk
Wipes everything out on the NAND and reflashes it with the OS provided in the IPSW. After, it will flash the NOR with the firmware files in the IPSW, and if it is an iPhone, re-flash the baseband as well (provided it is not an earlier baseband version, except in the case of the iPhone 4 which depends on whether or not Apple is signing the baseband firmware you are trying to flash).
You need to restore from a backup to get any of your contacts, applications, etc. back after a complete restore with this.