Pwn20wnd on Twitter: "@MTAC8 @PwnedC99 The boot nonce is not readable/writeable. unc0ver momentarily patches nvram to do this and unpatches. The jailbreak would fail if the nonce was not set. And if
noncereboot - set nonce on iOS 10.3 up to iOS 13
How To Set Nonce Generator Value For Downgrade, No Jailbreak
KEEP CALM AND KILL A NONCE - Keep Calm and Posters Generator, Maker For Free - KeepCalmAndPosters.com
Guide to futurerestore Part 1: How to set a generator