Opening a world created in version 1.20+ in a 1.17 client will likely corrupt your save data . Always back up your worlds before switching versions.
In conclusion, while the urge to download a specific 1.17 IPA is understandable for preservation or technical reasons, the digital safety risks far outweigh the benefits. Protecting your device and your personal data should always take priority over accessing an outdated version of a game through unverified links. apps for development purposes or how to back up your worlds before updating? minecraft 117 ipa download link
Once you have located a reliable Minecraft 1.17 IPA download link, you cannot simply "open" it like a standard app. You will need a side-loading tool: Method 1: Sideloadly (PC/Mac) Opening a world created in version 1
The easiest and safest way to get Minecraft 1.17 on your iOS device is by downloading it directly from the App Store. Here’s how: Protecting your device and your personal data should
Buy from the App Store
The Caves & Cliffs Update Part I has been released! : r/Minecraft