My All-in-one Dell Inspiron was listed to receive the Windows 11 update. For a reason, I don't know, my minimum and maximum clock speed was stuck at 0.4ghz instead of at least 1ghz, hence unable to upgrade to Windows 11. I engaged the Dell support team, after 2 days of back-and-forth communication, the problem was identified.  Updating to the latest Chipset driver solved the issue.
My Dell Inspiron 5400 AIO is stock with a Minimum Clock Speed of 0.400 GHz and a Maximum Clock Speed of 0.400 GHz, with a base speed of 3.500 GHz. How do I increase the Minimum Clock Speed to 1.000 GHz to upgrade to Windows 11? [IMAGE]  
Inspiron 5400 AIO, CPU clock speed, Windows 11