Why OS Recovery is unavailable?

Did the system ship from Dell with an OS?  Or was it shipped without a factory OS?

No, if i need to reset pc i can't i only have one pc i need fix for this reason

Go to dell.com/support and enter the service tag.  With what OS was the system shipped from Dell?

I can't find but theres Windows 11 logo on keyboard and i tryed to re-install OS Recovery(from Support Assist)but it boots Windows 11

Sorry the OS recovery is off probably because i updated bios and my pc supports reset

I can't boot to Support Assist OS Recovery.

i will re open the disscussion

You need to answer the question:  with what operating system did the system ship from Dell?  In some parts of the world, systems can ship without Windows, or with Linux or even without an OS.  If your system shipped without an OS, there will be no recovery image.  Use the service tag to look up the system details, or contact the seller of your system (it may be they added Windows, in which case you'll need to download it from Microsoft to reinstall it).  If Windows was activated on the system, reinstalling it will auto-activate the new install.

You can create Windows 11 media even if Dell doesn't have it for download for your model.

https://support.microsoft.com/en-us/windows/create-installation-media-for-windows-99a58364-8c02-206f-aa6f-40c3b507420d