There are tons of discussions that talks about this issue with Cydia Impactor in iOS 11. Unfortunately, Saurik’s sideloading tool is currently not compatible with any version of iOS 11, despite using the very first beta.
Even though Impactor is not the only utility that allows you to install modified .IPA file to your iOS device without jailbreak, it remains as the most popular and easiest method.
If you have already updated to iOS 11, here are some workarounds.
Cydia Impactor also shows this error when sideloading with an iPhone running iOS 11 beta 4. The entire message reads, “lockdown.cpp:57. LOCKDOWN_E_PLIST_ERRORâ€.
Option 1: Downgrade back to iOS 10.3.3
That’s right! If you don’t do it now, Apple may close the signing window very soon. iOS 10.3.3 is still available for users to go back to.
Here’s why it’s a win-win situation for you:
iOS 11 is not very stable at this moment. Sure, it’s far better than the initial developer beta, but there are still tons of bugs in this firmware.
Both iOS 11 and 10.3.3 don’t have a jailbreak tool yet. Which means, either way, you won’t have anything to lose in term of compatibility.
You can upgrade to iOS 11 at any given time or when Cydia Impactor is updated to work with the new firmware.
Check out this tutorial if you need help downgrading from iOS 11.
Option 2: AppValley
Just like Cydia Impactor, AppValley lets you install ++ and tweaked apps on your iPhone or iPad (no jailbreak required).
The only difference is the signing certificate. When you use Impactor, you’re signing the app with your Apple ID (the certificate usually expire after seven days). However, with third-party apps like AppValley, it could be more or less.
The upside of this app is that you can install it directly on your iOS device. Click here to visit the page and tap on “Install AppValley.†If this app got revoked (showing unable to download the app), you can try a similar site such as IPASigner.io.
That’s right! If you don’t do it now, Apple may close the signing window very soon. iOS 10.3.3 is still available for users to go back to.
Here’s why it’s a win-win situation for you:
iOS 11 is not very stable at this moment. Sure, it’s far better than the initial developer beta, but there are still tons of bugs in this firmware.
Both iOS 11 and 10.3.3 don’t have a jailbreak tool yet. Which means, either way, you won’t have anything to lose in term of compatibility.
You can upgrade to iOS 11 at any given time or when Cydia Impactor is updated to work with the new firmware.
Check out this tutorial if you need help downgrading from iOS 11.
Option 2: AppValley
Just like Cydia Impactor, AppValley lets you install ++ and tweaked apps on your iPhone or iPad (no jailbreak required).
The only difference is the signing certificate. When you use Impactor, you’re signing the app with your Apple ID (the certificate usually expire after seven days). However, with third-party apps like AppValley, it could be more or less.
The upside of this app is that you can install it directly on your iOS device. Click here to visit the page and tap on “Install AppValley.†If this app got revoked (showing unable to download the app), you can try a similar site such as IPASigner.io.
Option 3: Xcode + iOS App Signer
A Reddit user recently shared his solution to this problem. It’s relatively easy but required users to have a macOS computer.
A Reddit user recently shared his solution to this problem. It’s relatively easy but required users to have a macOS computer.
You can share on Facebook or Twitter.
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