I need fix my computer its not working please help me

iOS 11 is compatible with these iDevice

iOS 11 is compatible with these devices - Apple Support

macOS 11 for computers requires these Qualifying computers

macOS Big Sur 11 hardware requirements

The Age of this computer will Govern what newer version of macOS it will Qualify to install.

Use About this Mac from the Apple Icon on Desktop - the required Information will be there.

With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. 

For Best results use Safari to commence the download as Others may not work.

Safari will open a redirect and open the Apple Store where the download can commence.

Does this computer appear as Listed and qualifying for an upGrade to a newer version of macOS? 

ujin0617 wrote:

please I want ios11

You will have to provide details and context of your issue and equipment. Read this user tip:

https://discussions.apple.com/docs/DOC-5931

We can’t help you if you don’t tell us what’s wrong…