I have an iOS 12 device but need iOS 13 features!
>this post is deciding if the grass is greener<
Can I downgrade to a firmware I have keys for...?
Do you think downgrades will be possible to un-cyrpted firmwares if you have keys on -A10 devices?
(01-04-2020, 04:58 PM)Lexieye Wrote: [ -> ]I have an iOS 12 device but need iOS 13 features!
>this post is deciding if the grass is greener<
Can I downgrade to a firmware I have keys for...?
Do you think downgrades will be possible to un-cyrpted firmwares if you have keys on -A10 devices?
Since we're talking about an A10 device, that means iPhone 7 / 7 Plus or iPod touch 7th Generation.
All of these are compatible with CheckRa1n / CheckM8 exploit and therefore can be tricked into installing a CFW (iOS Custom Firmware) BUT, it would be tethered.
The keys aren't exactly useful unless you try to patch something and it's encrypted, like a bootchain component or file system.
Downgrading with CheckRa1n would, in theory, be possible but you will be fully tethered because you would patch the signature checks of the bootchain to avoid checking SHSH2. That means without a computer you cannot boot at all.
With SHSH2 blobs you may able to downgrade untethered because you don't need to patch the bootchain to ignore the blobs, however, SEP and Baseband remain a problem. These are rarely compatible that far down, and iOS 13's SEP and BB are NOT compatible with any iOS 12 version, so no downgrade (phone wouldn't boot without SEP as it handles everything from encryption to passcode to keys). It would boot without a baseband (likely) but no signal (Cellular) so largely unusable.
CheckRa1n / CheckM8 cannot remove the need for a compatible SEP and Baseband. It just removes the need for tfp0 and Nonce Setters and adds the possibility to go all in and hard-patch stuff but that turns your restore in a tethered one for life.
I would personally go to iOS 13.3. It's stable and looks great. iOS 12 is... not exactly what I call the best, especially iOS 12.4.