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A comment on It's your device, you should be able to repair it. Parent comment

Re:It's your device, you should be able to repair it by judge2020 on Friday April 30, 2021 @01:08PM (#26996183)
You can always install the old version, Apple just doesn't think they can optimize new iOS versions to make old phones work well with the new software (and the bloat/feature creep within).
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Re:It's your device, you should be able to repair it by LocalH on Friday April 30, 2021 @02:01PM (#26996998)
No you can't, and you haven't been able to in some time. Apple devices that need restoring post-EOL are generally restricted to the last-released version. I think you have to go back to the original couple of iPhone models to be able to ignore SHSH and APTicket.

There are ways around this with some models, but it's been a long time since it was even "save SHSH blobs and replay them" easy.

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Re:It's your device, you should be able to repair it by EvanAnderson on Friday April 30, 2021 @01:40PM (#26996697)
Without circumventing protections you cannot install old versions of iOS. Many phone models have flaws in the protections that allow you to circumvent the protections, but officially installing old iOS versions ends when Apple decides.
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