How to downgrade

[ryota]

Is there a way that a specific way to download the Kernel of a version of linux?

[ludwik]

Why not just use an older version? Whats the difference between them anyway?

[ez2c]

Depending on what flavour of linux you are running be sure to back up your existing kernel and modules so that you can revert to them.

[augustine]

I suggest just taking the old one and reinstall. No point going through all the trouble unless you upgraded it yourself and can't go back to the original.