Dell released latest BIOS update on Nov.3. With this version 2.4.0 BIOS, the CPU clock speed is recognized as 1.19GHz in Windows rather than 0.9GHz. It's OK to upgrade to Windows 11 now.
The processor clock speed is the only requirement that this laptop doesn't meet. However the processor model, Intel i3-1125G4, is on the support list for Windows 11. The processor is recognized as "11th Gen Intel(R) Core(TM) i3-1125G4 @ 2.00GHz 883 MHz" in Windows 10, while that said "883MHz" is this CPU's TDP-down Frequency. I have no idea why Windows would compare a TDP-down Frequency with Windows 11 requirement. I don't know whose fault this is, Microsoft, Intel or Dell. [IMAGE]
Inspiron 13 5310, cannot upgrade to Windows 11