I’d like to preface this by saying: 1. With the exception of these tweets, I don’t really want to provide support for this. Its really cool that this is possible, but this is not really the intended purpose of succession and I don’t want it to be
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2. I was never personally able to get this to work.
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If you are using succession, there’s a lesser-known feature where you can provide your own IPSW instead of using the built-in downloader. I added this so that if the downloader was failing or if you’re running a beta or something, you can still use succession.
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Historically, providing a mismatched IPSW and restoring to it would cause the device to refuse to boot, as low-level checks would detect massive filesystem damage and send the device to recovery mode.
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Because of this, there's an even lesser-known feature where if you accidentally provide an incorrect IPSW, Succession will warn you of this, and strongly suggest that you not proceed. However there *is* an option to override this check.
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Anyway, it seems that booting with checkra1n bypasses the low-level checks, and in *very limited* circumstances, the device is able to boot the new version (I was not able to do this when restoring 12.1.2->12.3, but
@PixelmonGalaxyY successfully did it from 13.3->13.0b5)Prikaži ovu nit -
However once he got there, practically everything (USB connections/wifi/cell data/etc.) was broken and he couldn’t activate. Excluding /usr/share/firmware seemed to fix wifi but not USB.
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Succession 1.4.8 (still upcoming) will have an option to exclude that folder. This option will be hidden, and you will have to manually edit the plist. I’ll post more details later.
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Also thanks to
@IMS2121 who was also testing it... (did it ever work for you?
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*once 1.4.8 is released* (which is still a few days out), here's how to enable the 'downgrade mode' 1. Install succession 1.4.8 and open it 2. Open /var/mobile/Library/Preferences/com.samgisaninja.SuccessionRestore.plist 3. Set unofficial_tethered_downgrade_compatibility to 1pic.twitter.com/uotb7NzKmw
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