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I have my blobs saved for Iphone X 10,6 12.3.1 and 12.4. I am currently on version 12.1.3 and would like to upgrade to 12.4 but if I am unable to because of the undownloadable IPSW file for 12.4 then I am fine with going to 12.1.3 but preferably would like to upgrade to 12.4 but I don't know how? I know about Future restore and Checkm8 but I don't know if I will I be able to upgrade and is what I am trying to do achievable? And if so then how exactly do I upgrade with my blobs to 12.3.1 or 12.4 is there someone that can explain how to do it with my specific situation? Please let me know....
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Your better going to any ios 13 version except 13.3.1 as the sep and baseband currently signed should be compatible with 13.3.
The only way to upgrade any version that isn't signed is to somehow get apple to resign it which won't happen.
So far the the 13.3.1 has signed baseband and sep so if they are compatible with 13.0 to 13.3 you might be able to update to one of those versions.
You will also need the right shsh2 blobs and set the generator to that one.
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Not sure why you want to upgrade to 12.4, when u can goto 13.3. Checkrain can also jb any iPhone X firmware.
I have iPhone Xs 12.0.1 with all correct saved bloobs/apnonce. There is very little info to upgrade to 13.3 using futurerestore.