Windows 10: 0x800700c1 error 21H1-H2

Hi I want to update my windows from h1 to h2 and recieving this error. Please help.

:)

 

0x800700c1 error 21H1 - H2

Hi i want to update my windows from H1 to H2 but im always facing the same error ( 0x800700c1 )

i tried to clean my register and run troubleshooter but nothing works what can be the problem?

 

0x800700c1 error 21h1 - H2

Hi, I want to update my windows from h1 to h2 always facing this error code. I clean my register and troubleshooter won't help. What to do?

 

0x800700c1 error 21H1 - H2

Hello Adrian. I'm Greg, 10 years awarded Windows MVP, specializing in Installation, Performance, Troubleshooting and Activation, here to help you.

If you prefer to do the upgrade then first try these fixes for Overcoming Version Upgrade Failures: http://answers.microsoft.com/en-us/windows/wiki...

If those steps do not work then since you are also trying to Clean Install, I will give you all possible steps to troubleshoot Windows installation failure that I've given to thousands of others in this situation and which work in about 90% of cases. If not we'll go from there:

Follow the gold standard Clean Install steps in this tutorial which compiles the best possible install that will stay that way as long as you stick with the tools and methods given: http://answers.microsoft.com/en-us/windows/wiki...

I am the author of this Clean Install tutorial which has been used by millions of consumers in Windows 7 and 10, and helped popularize Clean Installs with consumers over the past decade. In addition I've helped troubleshoot tens of thousands of cases of install failure and never had one fail to get installed if there is close cooperation. So let's get started:

Make sure all other drives and peripherals are unplugged. Update the BIOS or UEFI firmware to latest, or reset to Defaults, making sure (if you have it) UEFI is enabled, CSM or Legacy BIOS disabled, Windows Boot Manager set first to boot, if necessary disable Secure and Fast Boot until after install, set SATA controller to AHCI, Save changes and Exit. Access BIOS/UEFI Setup as shown here: https://www.mydigitallife.net/comprehensive-lis... https://www.groovypost.com/howto/reset-pc-bios-...

Create the latest Windows 10 Installation Media by installing Media Creation Tool and following the directions here: http://windows.microsoft.com/en-us/windows-10/m....

If you're using another PC to do this uncheck the box for Recommended Settings to choose the exact version and bit rate for the target PC only. Insert media, boot it by powering up PC while pressing the BIOS Boot Menu Key: https://www.sysnative.com/forums/hardware-tutor...

If the media won't boot you may need to enter BIOS/UEFI Setup (pressing key given in chart in link above) to turn off Fast Boot or Fast Startup first. If you can start Windows enter UEFI firmware here: http://www.isunshare.com/windows-password/four-...

The media may also be bad, so confirm it boots and queues up per these steps in another PC, or else recreate it. You can also try a DVD, or the alternate download site from MS TechBench here: TechBench by WZT (v4.1.1). Burn to DVD using WIndows Image Burner or create bootable flash using one of the options here: https://www.tenforums.com/tutorials/2376-create...

Choose the boot device as a UEFI device if offered, on first screen press Shift + F10 to open a Command Prompt, type the following commands, each followed by Enter key:

DISKPART

LIST DISK

SEL DIS # (replace # with the disk # of the Windows disk from list in previous command)

CLEAN EXIT

Close Command Box, on second screen choose Install Now, then Custom Install, then at the drive selection screen choose Unallocated Space, click Next to let it create needed partitions and start install - this makes it foolproof.

Make sure to follow the setup steps in the first link tutorial to complete your install. Drivers are important enough that those steps are printed in red. If installation stalls or won't complete, try disconnecting from the internet. You will get and keep the best possible install to the exact extent you stick with the steps, tools and methods in the first linked tutorial. It's a better install than any amount of money could buy and a great learning experience that will make you the master of your PC.

Failures and errors during the Setup phase can often be overcome by disconnecting from the internet, e.g. unplug router.

If all else fails you can move the hard drive to another PC to do the install with it plugged in alone. Windows 10 is remarkably adaptive to new hardware without needing adaptive restore. If it will start it will swap out all drivers requiring several restarts. You can also try applying a same-version System Image to the intact SSD/hard drive.

Please report back the results of each step so I know what else to suggest.

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