After upgrading to windows 10 pro on a tablet of mine that came preloaded with windows 10 home, I would like to downgrade it back to home. However, the tablet doesn't have a recovery partition and I don't have the licence key for home.. How can I simply revert back to the original windows edition I had? BTW I have tried the reset your PC thing.. needless to say, it didn't work
As my last answer was irrelevant, I have changed it.
I found a site where you can download a tool to reinstall windows 10, and it has instructions. I will be posting them here, but with a few tweaks.
Since your license key is already in your firmware, just select the "home" version of windows 10 when reinstalling.
Follow these instructions to perform a clean installation of Windows 10.
If you format a drive partition during installation, any data on the partition will be erased. Be sure to back up any data you want to keep before you begin.
Run the media creation tool.
Select Create installation media for another PC.
Choose the language, edition, and architecture (64-bit or 32-bit) for Windows 10.
Follow the steps to create the installation media, and then select Finish when it’s done.
When you’re ready to perform a clean installation, turn on your PC, insert the DVD or USB flash drive you created, and then shut down your PC.
Restart your PC, and then press any key to boot from the DVD or USB flash drive.
If you restart your PC and your current version of Windows starts, you might have to open a boot menu or change the boot order in your PC's BIOS or UEFI settings so that your PC boots from the media. To open a boot menu or change the boot order, you'll typically need to press a combination of keys (such as F2, F12, Delete, or Esc) immediately after you turn on your PC. For instructions on changing the boot order for your PC, check the documentation that came with your PC or go to the manufacturer's website.
If changing the boot menu or order doesn't work, try again by signing in to Windows, shutting down, and then starting your PC.
On the Install Windows page, enter your language and other preferences, and then select Next.
Select Install Windows.
On the Enter the product key to activate Windows page, click skip.
Since you’ve already activated Windows 10 on this PC, you won't need to enter a Windows 10 product key. You can skip the product key page by selecting the Skip button. Your PC will automatically activate later.
On the License terms page, if you accept the license terms, select I accept the license terms, and then select Next.
On the "Which type of installation do you want?" page, select Custom. On the "Where do you want to install Windows?" page, select the partition that you want, select the formatting option you want to perform (if needed), and then follow the instructions.
When you've finished formatting, select Next.
Follow the rest of the setup instructions to finish installing Windows.
Hope this helps!