MacRumors reports that Apple has stopped signing the iPadOS 18 update for M4 iPad Pro models, which means the new software is no longer available to be downloaded and installed.
I’ve had no problem on my M4 iPad Pro after installing the operating system update. However, there are reports on Reddit from iPad Pro users who had an interruption in the installation process, leading to an iPad that refused to turn on. A total replacement was required for affected users. MacRumors says that Apple will make the software available again when the underlying problem has been addressed.
AppleInsider notes that all other models of the iPad capable of running iPadOS 18 are continuing to receive the update as usual, and are seemingly unaffected by the bricking issue.