can I update my hp pavilion I5-421U processor

[Rockyusa1]

can I update my laptop to run winows 11

[Paul_Tikkanen]

No. the processor is an integral part of the motherboard and cannot be upgraded.

If you are happy with your PC, and if you are interested in doing an in-place upgrade from W10 > W11 24H2 on your PC as is, watch this video, which is the easiest way to do it in my opinion, and I have tried many different ways to do this during the last 3 years.

How to Install Windows 11 on Unsupported PC in 2025 (New Easiest Method, No CMD)

Download the W24H2 ISO file and use that (3rd option).

Download Windows 11

You can download the free 7-Zip file utility from the link below. The top line is for 64 bit.

7-Zip

You'll have to repeat this procedure each October when Microsoft rolls out the new builds because a PC that does not meet Microsoft's minimum W11 hardware requirements will never automatically get the update to the next build.

Other than that, your PC will continue to get the monthly cumulative and other updates.

That's only a minor inconvenience to have continued OS support beyond October of 2025.

I upgraded my HP 350 G1 notebook which has an i3-4005U processor using the above method to W11 24H2 and it works just fine.