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How do you know which versions of iOS/iPadOS activation is allowed by Apple now?

by Poster May 30, 2025 10
Have a few old iOS devices at home. Want to reset it. But I've heard that iOS whose activation server is turned off can't be activated again. I know that besides the latest iOS18, there are several older versions of iOS17, 16 that are offering some security updates. It stands to reason that the recently released security update of the old system should still be activated. But it can't be activated after how old the version? And after a period of time, for example, if a major version has not released security updates, how can we know clearly whether these major versions can still be activated at this moment?

Replies

  • Anonymous2246 May 30, 2025
    Old equipment does not have to be considered. Just update it
  • Anonymous2370 May 30, 2025
    You can check it on ipsw.me. It should only be 18.5 at present. Verification has not been turned off. It seems that some devices still have 18.3?
  • Anonymous1711 May 30, 2025
    Resetting in iOS only verifies your apple id lock. Activation only appears after flashing the version. Using DFU in iTunes can only flash the last version supported by this model. You cannot enter without jailbreaking and flashing into the old version of iOS
  • Anonymous564 May 30, 2025
    "Erase all contents and settings" and "rebrush the firmware" are different. "Rebrush the firmware" will verify the system version.
  • Poster May 30, 2025
    @ Anonymous2246 I heard people say before that particularly old devices should not be reset at will, because there may be no way to activate them again after reset. From ipsw.me, it seems that there is no need to worry, even if it is old as an iPhone4, there is iOS 7.1. 2 (11D257) that can restore. @ Anonymous2370 Generally, only one sub-version of the same large version can be activated. This is normal.
  • Anonymous7775 May 30, 2025
    Activation is no problem except for a few specific bugged versions
  • Anonymous7345 May 30, 2025
    The version that can be updated to is the verifiable activation version
  • Anonymous1024 May 30, 2025
    https://ipsw.dev/beta version, some RC can still be brushed
  • Anonymous966 May 30, 2025
    Connect to i4 and you will know by flashing the interface
  • Anonymous8761 Jun 1, 2025
    ipsw.me