After an upgrade from Windows 10 to Windows 11 there is a default go back period of 10 days.
Before the 10 day period ends the modified go back period can be modified up to 60 days.
This process can be repeated again adding up to 60 days.
If the 10 day default period or modified 60 day period expires then there is no longer an option to use the go back option.
Once there is no longer a go back option the only methods available to return to Windows 10 are to install a fresh version or restore a backup image that had been manually created.
If there was no backup image made with third party software then the remaining option is to backup important files and install a fresh version of Windows 10.
1) Consider making free backup images of the Windows 11 installation
(Acronis, Aoemi, EaseUS, Macrium, Paragon, etc.)
2) Backup important files
3) Find a flash drive that you can format ( > or = 8 GB).
4) Create a bootable Windows 10 iso:
4) Boot to the flash drive:
5) Delete all partitions making an unallocated disk drive
6) Clean install Windows 10:
7) Reinstall drivers from the computer, motherboard, or component manufacturer websites
8) Reinstall applications
9) Consider making free backup images of the Windows 10 installation
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