

Running Windows Update Troubleshooter may solve some update errors including the error 0xc1420121. Method 1: Run Windows Update Troubleshooter There are several methods below, and you can choose one of them to solve the problem. But whatever case you are in, you can fix the error 0xc1420121 quickly. Certainly, there are other reasons that cause this error. Some users reported that this error 0xc1420121 usually happened after installing Macrium Reflect.

How to solve this problem? Well, this post from MiniTool Partition Wizard will offer you some solutions.

Some Windows 10 users may receive an error message “We couldn’t install this update, but you can try again ( 0xc1420121)” when trying to update their OS or installing feature update to Windows 10.
