You can install whatever the latest version of iOS is available for that device. In case of iPhone 5s that would likely be iOS 12.4.3 at this point.My mom might be giving me her iPhone 5s. But I know you can’t install iOS 13 on it. Is there any loophole or whatever to install these newer versions on older devices?
Yes, I know, but is there any other way to update to even newer versions, like iOS 13? Like do I have to download a version of iOS 13 for newer phones and install it on the phone through iTunes, or?You can install whatever the latest version of iOS is available for that device. In case of iPhone 5s that would likely be iOS 12.4.3 at this point.
There's lots that jailbreaking can do, but this isn't one of those things. No version earlier than what the device was released with and no version later than what Apple cuts it off at.Don’t think it’s an option without jail breaking the phone.
Some newer features are dependent on newer hardware. Even if you could get it installed (and you can't) you could be missing what iOS needs for those new features to work.