On iDevices, blobs are essential for a successful downgrade. However, a new or inexperienced user might find trouble finding the right tools to save them.
Jailbreak
A collection of 3 posts
How to save SHSH2 blobs

Great news for the jailbreaking world!
It looks like the great minds of our wonderful community never stop surprising us. Why? Well, 10 hours ago @axi0mX on Twitter published this tweet: EPIC JAILBREAK: Introducing checkm8 (read "checkmate"), a permanent unpatchable bootrom exploit for hundreds of millions of iOS devices. Most

The unc0ver jailbreak for starters
Yesterday, unc0ver by @Pwn20wnd got bumped to version 3.7.0b1, adding support to A12 (= 2018 models) devices on iOS 12.4. You're interested, so you want to try it on your iPhone XS Max, but you don't know where to start. I've got