Q: How do i update from ver 2.1 to ver 9.2

Hello guys,

I'm sorry if this has been posted before, but i did try searching for it.

I recently downgraded my ver 11.2 to ver 2.1.

I wish to upgrade my firmware to ver 9.2 as i need to extract a private header from one of my games.
And all i know is that the version must be between 4.1 to 9.2.

Can someone give me a tutorial on how to do it.
Or at least point me in the right direction,

Thank you