Even though Limera1n is a bootrom-level jailbreak you still need to backup your iOS 4.1 hashes.
Because the “untethered” part of this jailbreak comes from a userland hack from @comex, you should still backup your SHSH hashes for 4.1. Do this by either letting Cydia keep them (“make my life easier”), or using Tiny Umbrella. This way you can always come back to an untethered, jailbreakable 4.1 on your devices after Apple has closed their 4.1 signing window (they’ll close the 4.1 window once they push out their next firmware version). If you fail to do this and ever need to restore to 4.1 again, you can still jailbreak but it will be a tethered JB (you’ll need to connect to your computer to finish the booting process, each and every time).
You can backup your iOS 4.1 SHSH blobs without even being at 4.1 or being jailbroken by following the tutorials below:
● How to Backup Your SHSH Blobs Using Firmware Umbrella (Windows)
● How to Backup Your SHSH Blobs Using Firmware Umbrella (Mac)
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- Posted using my iPhone 4