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Ask Jerry: How do I get my Wi-Fi toggle widget back?
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The bigger issue is that with API 29 Google also changed some rules about system settings and connections, making it so an app developer couldn't just create a switch to turn off Wi-Fi. The harder part is to set up your phone and a computer (Windows, Mac, or Linux all work fine) to use adb(Android Debug Bridge). Since Android 14, you can't sideload apps built on depreciated SDK versions automatically, but you can force install them using the command line.
Or read this on Android Central