FIRST : update to 10.3 beta 1 14e5230e 2 : download http://api.tihmstar.net/builds/noncestatistics/noncestatistics-latest.zip run : noncestatistics huhu.txt until 1000-2000 nonce then type CTRL+C run : noncestatistics -s huhu.txt u will have this : https://pbs.twimg.com/media/C5EijN0WYAAj-Ht.jpg search if you found the same nonce in your blob folder like this: https://www.noelshack.com/2017-08-1487567885-goodnonce.jpg take the .shsh of one 3/make a folder on desktop named "downgrade" put the .shsh file . 4/ download the ipsw of 10.2.1 rename in .Rar extract him, take the BuildManifest.plist and the .bbfw and im4p corresponding (google) put this 3files in downgrade folder with futurerestore http://api.tihmstar.net/builds/futurerestore/futurerestore-latest.zip 5/ download ipsw 10.2 put in downgrade folder... 6 / ./futurerestore -t 8197106317392_iPhone6,2_n53ap_10.2-14C92.shsh -b Mav7Mav8-7.21.00.Release.bbfw -p BuildManifest.plist -s sep-firmware.n53.RELEASE.im4p -m BuildManifest.plist -w iPhone_4.0_64bit_10.2_14C92_Restore.ipsw
et voila ! i know i have write like a pig but im tired its 6h30 morning here and there are a good video from tihmstar who explain that much much much better than me
Credits: Reddit