14 DAY TRIAL // A critical bug in the most recent cumulative update for Windows 10 version 1809 (October 2018 Update) has just been fixed.
Users running security products from ArcaBit discovered that after installing Windows 10 cumulative update KB4493509 their devices were no longer able to boot and became unresponsive.
Microsoft acknowledged the issue in an update to the original KB page last week, saying at that point that a fix was in the works with no specific ETA offered to users.
“Microsoft and ArcaBit have identified an issue on devices with ArcaBit antivirus software installed that may cause the system to become unresponsive upon restart after installing this update,” the company said.
Fix now available
In another short update today, Microsoft explains that the issue is fixed now and users just need to update to the latest version of ArcaBit in order to install the patch.
“ArcaBit has released an update to address this issue,” the software giant notes, linking to an ArcaBit support article that doesn’t seem to provide any other details at the time of writing this article.
The company, however, doesn’t offer more information regarding the steps users should follow in case their devices are no longer able to boot in order to deploy the antivirus update. Furthermore, given the ArcaBit support article isn’t working, the only option is to boot to Safe Mode, uninstall the update, then boot back to the desktop to update the antivirus software, and only then install the update once again.
No specifics have been shared on the number of users whose devices ended up unable to boot, but the good thing is that the patch was developed and released to users in just a few days.
No other antivirus products are believed to be impacted by cumulative update KB4493509 issues, so it should technically be safe to install it regardless of the security software on your device.