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If I factory reset my iPhone 6 (currently running iOS 9.3.5), which version of iOS will be installed after the reset?

  • I imagine a lot of users might think a hard-reset would restore an earlier OS because older smartphones/smart-devices (at least the ones I used) had a built-in ROM from which the original OS was restored from during a hard-reset - any subsequent OS updates were stored in Flash (and so were lost during a hard-reset). Some early Microsoft PocketPC devices needed their ROM chips replaced for an OS update as Flash storage was so small back then. – Dai Sep 10 '16 at 7:11
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Erasing All Contents and Settings (what most people call “factory reset”) does not change/remove your operating system. Whatever OS you had installed prior to the reset will remain after your iPhone reboots.

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