To downgrade from iOS 26 beta to iOS 18, you must reset your iPhone, as simply removing the beta profile won't revert the system. Backing up your device prior to installing a beta is crucial, as beta backups are typically incompatible with older software. Uninstalling the beta requires a computer to enter Recovery Mode and install the stable version of iOS. While the iOS 26 beta may exhibit issues like battery drain and app glitches, such bugs are typical of pre-release software.
You can't uninstall iOS 26 beta to use iOS 18 without resetting your iPhone. Simply removing a beta profile or deselecting beta updates won't revert the changes.
As an operating system, iOS is your iPhone's bedrock software. If you want to downgrade from iOS 26 to the stable public version of iOS 18, you'll need to restore your iPhone.
iOS 26 developer beta is no more buggy and unstable than other developer beta versions. Any time you install a beta version of software, you're installing pre-release software.
Using a developer beta on an iPhone may present diminished battery life, unreliable app performance, glitching, and overall sluggishness. However, these are expected bugs.
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