In a series of tweets following the untethered jailbreak of an iPhone 4 and iPod touch 4G, hackers Pod2g and iH8sn0w clarify that those planning to unlock their phones should carefully save their SHSH blobs before updating to a stock IPSW from Apple, or OTA.I reported earlier today that Pod2g had confirmed on Twitter an untethered untethered iPhone 4 jailbreaking under iOS 5.0.1. "Feel free to update,” the hacker had said. However, Pod2g had failed to note that people who also require an unlock must carefully save some firmware-related files before updating.
“Of course, if you want to SIM unlock, don't update using Apple's original FW nor update OTA,” he later clarified and thanked one of his followers for pointing that one out.
Hacker iH8sn0w them joined the conversation to “recommend to all users to dump their SHSH blobs/apticket (before and after updating if they are going to do so) with iFaith.”