Specifically, 12.5.7 patched a WebKit vulnerability (CVE-2022-42856) that allowed for remote code execution. In layman’s terms: Hackers could take over your old iPhone just by tricking you into clicking a link in Safari.

If you're unable to find or download Instagram, it might be due to compatibility issues or the app's requirements. Consider reaching out to Apple Support or Instagram's Help Center for further assistance.

So, when you download the system update 12.5.7, you are securing the ship. But Instagram is no longer a passenger on that ship.

Here is the mechanism:

If you search for "Instagram iOS 12.5.7 download," you aren't looking for a new feature. You aren't excited about Reels or Threads. You are likely staring at a greyed-out "Update" button in the App Store, a broken icon on your home screen, or an error message demanding iOS 14 or 15.

If possible, updating your iPhone to a newer version of iOS would allow you to download and use the latest version of Instagram. Go to Settings > General > Software Update to check if there's an update available for your device.

Open the App Store on your iPhone 6 or 5s.

If you see a "Get" button instead of a cloud icon, the App Store will likely block the download. You can use these methods to bypass this restriction: 1. The "Newer Device" Workaround

If you are determined, here is the exact sequence that works as of today: