Microsoft has released KB4565503 patch for Windows 10 PC/laptops to fix the Thunderbolt Dock issue
If you remember, when Microsoft released the May 2020 mega-update, Windows 10 2004, it caused issues with the Thunderbolt Dock on many PC and laptops. The bug was found to trigger the Blue Screen of Death in certain incompatible PC/laptops so users who wanted to upgrade to Windows 10 2004 were automatically blocked.
There any PC/laptop that had Thunderbolt dock incompatibility issues triggered an upgrade block for Windows 10 version 2004. this meant that Windows 10 users who suffered the Thunderbolt Dock issue were not allowed to install the Windows 10 2004 version. At that time Microsoft had said it was investigating the matter and bypassing the Windows 10 2004 upgrade block to install updates could cause Blue Screen of Death fatal error.
Intel and Microsoft have found incompatibility issues when Windows 10, version 2004 (the Windows 10 May 2020 Update) is used with certain settings and a Thunderbolt dock. On affected devices, you might receive a stop error with a blue screen when plugging or unplugging a Thunderbolt dock. Affected Windows 10 devices will have at least one Thunderbolt port, have Kernel DMA Protection enabled, and Windows Hypervisor Platform disabled. To verify your Kernel DMA Protection settings, please see How to check if Kernel DMA Protection is enabled. To verify your Windows Hypervisor Platform settings, select Start, type turn windows features on or off and select it. When the Windows Features dialog opens, find the setting for Windows Hypervisor Platform. If it is note checked, then Windows Hypervisor Platform is disabled.
Windows Security Bulletin
Now, Microsoft has released a fix for the Thunderbolt dock issue with the Windows 10 cumulative update KB4565503. The KB4565503 patch has been released as a part of the July 2020 cumulative patch includes a fix for a compatibility glitch with Thunderbolt docks.
Windows 10 2004 upgrade block due to Thunderbolt dock issues removed
Microsoft has a policy of putting upgrade blocks when it or the users discover a new issue hitting its latest feature update. They are lifted once the bugs are resolved, which can typically take anywhere from one week to several months. The July 2020 cumulative update for Windows 10 2004 version resolves the problem with Thunderbolt docks. Apply the KB4565503 patch will also enable the blocked Windows 10 PC/laptops to get new feature updates automatically.
Microsoft has said that the upgrade block is “estimated to be removed in the coming days,” so if the May update still doesn’t show up in Windows Update on your PC/laptop, just wait for a few more days until the block is removed. You can, however, upgrade your PC/laptop to Windows 10 2004 version directly with the Media Creation Tool.