The latest Windows 10 cumulative update is causing some PCs to fail to boot, and the only solution is a system restore.
Windows 10 users may want to hold off on updating their PCs: The first cumulative patch for the Windows 10 April 2018 update is causing some PCs to enter a cycle of failed boots.
The bug in update KB4103721 was first reported by Microsoft forum users, only some of whom were affected. Microsoft added a note to the KB4103721 patch notes stating "select devices with Intel SSD 600p Series or Intel SSD Pro 6000p Series may repeatedly enter a UEFI screen after restart or stop working."
Forum users have suggested a number of different causes as well, and Microsoft hasn't issued any additional statements regarding the bug.
SEE: Windows 10 spotlight: Prepare, repair, and recover (Tech Pro Research)
KB4103721 was designed to fix a number of issues that have arisen in the April 2018 update, but inadvertently caused a much more serious one. If you have a Windows 10 PC running the April 2018 update you should hold off installing this latest patch until Microsoft issues definite word that it has been fixed.
How to fix a Windows 10 PC affected by KB4103721
In both the Microsoft forum thread and the KB4103721 patch notes only one solution has been found to work: rolling back to an earlier version of Windows 10, as demonstrated on Windows Latest. Luckily for those affected, Windows creates a restore point before an update is installed, so if you can get to the Advanced Startup Options (ASO) screen you should be able to fix it.
- Reboot your computer and hit F11 as soon as it powers up--if you see the Windows boot logo you've missed your chance and will need to restart again. If you do it correctly you should be on the ASO screen. Note: F11 is the default key, but some manufacturers change this setting. If F11 doesn't work check your PC maker's website.
- On the ASO screen click on Advanced Options.
- Under Advanced Options click on Go Back To Previous Build.
- Windows should reboot, roll back, and start normally.
If you don't have a valid system restore point you're not out of luck--it's just going to take a few extra steps to solve the problem since you'll have to manually delete the update in Safe Mode.
- Start by booting into ASO. Once there, navigate to Troubleshoot > Advanced Options > Startup > Restart.
- When your PC reboots you'll have access to several boot modes, including Safe Mode and Safe Mode With Networking, either one of which will be fine for this purpose.
- Choose your option, boot into Safe Mode, and log in with your Windows credentials. Note: you'll need to be an admin in order to roll back an update.
- Once in Safe Mode, open the Settings app. From there go to Update & Security > Windows Update > View Update History > Uninstall Updates.
- On the Uninstall Updates screen find KB4103721 and uninstall it.
- Restart your computer and boot into Windows 10 normally. It should work fine.
If neither of those options works you may have to do a clean installation of Windows 10. It probably won't come to that, but it's best to hold off on that update just in case.
The big takeaways for tech leaders:
- A bug in the latest Windows 10 cumulative update (KB4103721) is rendering some PCs unable to boot. Microsoft reports the bug is affecting those with certain Intel SSDs.
- Windows users are advised to wait to install the update until Microsoft has fixed it. Those affected should be able to fix their computers using a restore point or by manually deleting the update from the Windows 10 Settings app.
- IT pro's guide to effective patch management (free PDF) (TechRepublic)
- Ready for Windows 10 April 2018 Update? How to take control (ZDNet)
- Windows 10 April 2018 Update: A cheat sheet (TechRepublic)
- Microsoft 365 bundle gets a slew of updates as part of Windows 10 April rollout (ZDNet)
- Windows 10 April 2018 Update could break a ton of critical features on your PC (TechRepublic)