Press and quickly release the Volume Down button.
On a Mac with macOS Catalina 10.15, open Finder. If you see the Apple logo or a red or blue screen during startup, try these steps: If your device turns on but gets stuck during start up
#Iphone recovery mode error 21 update
Click Update (not Restore) to reinstall iOS or iPadOS and keep your personal data.You should see this message: "There's a problem with the that requires it to be updated or restored." Connect your device to your computer using the cable that came with your device.Or on your Windows PC, make sure that you’ve installed the latest version of iTunes. On your Mac, make sure that you’ve installed the latest software updates (including iTunes if you have MacOS Mojave or earlier).If you still see the Restore screen after you restart, you need to reinstall iOS or iPadOS: iPad with Home button, iPhone 6s or earlier, and iPod touch (6th generation) or earlier: Press and hold both the Side (or Top) button and the Home button until you see the Apple logo.iPhone 7, iPhone 7 Plus, and iPod touch (7th generation): Press and hold both the Side (or Top) button and the Volume Down button until you see the Apple logo.
Press and hold the Side button until you see the Apple logo. iPhone 8 or later: Press and quickly release the Volume Up button.Press and hold the Top button until the device restarts. If you see the Restore screen, restart your device: If you see the Restore screen on your iPhone, iPad, or iPod touch, learn what to do. If you see the Restore screen on your iPhone, iPad, or iPod touch Follow this process below to keep your personal data.
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