Why you can’t upgrade your 7th gen Intel CPU for Win11

From Intel.com:

Compatibility concerns for Intel® Core™ i7 Desktop Processors that use the LGA1151 socket

Intel® Core™ i7-87xx Desktop Processors use a chipset based on the Intel® 300 Series Chipset Boards. Intel® Core™ i7-67xx and i7-77xx Desktop Processors use a chipset based on the Intel® 100 and 200 Series Chipset Boards. The i7-87xx processors are NOT compatible with Intel® 100 and 200 Series Chipset Boards.