Apple has been forced to suspend their iOS and iPadOS 17.3 beta update due to reports of bricked iPhones.
Apple has announced in their developer documentations that their iOS and iPadOS 17.3 beta version 2 update have temporarily been withdrawn. This is due to a number of reports stating that the update has prevented their devices from booting up.
Should ever this be a problem, users may need to first access Recovery Mode to revert the update by selecting a previous version of the iOS or iPadOS.
Apple has yet to announce a more stable version of iOS and iPad 17.3, but we will let you know when one gets announced.