> When users install a software version containing the ARB mechanism, this fuse will be permanently blown to record the latest security version. Once the e-fuse has been blown, the system will not allow the device to roll back to any older software version. This action is taken to prevent security vulnerabilities that could be exploited if the device reverts to an older operating system. Attempting to install an older software version on devices with ARB activated will result in complete hardware failure of the device. Since the e-fuse has been blown, traditional software recovery tools will no longer work. The only way to repair a device damaged by ARB is to replace the entire motherboard at official warranty centers.
https://www.reddit.com/r/Oneplusfans/comments/1qih996/oneplus_has_quietly_introduced_the_anti_rollback/
