Restoring iPhone and keeping existing (old) 3.1.3 OS

My legacy iPhone is due for a restore. It's been a long time and I'd like to keep it at it's current OS level - 3.1.3.
The restore screen tells me that it will upgrade the OS to the latest version. Is there a way to keep it at the current version?
I believe that 3.1.3 was the last version I downloaded. But there might be a later version on my drive. I really can't remember, and I'm not sure where it would have been stored if I did a "download only" of a later OS.
Any help would be appreciated.
coop

Thanks for the reply.
Of course, I'm not interested in downgrading. I'm interested in maintaining the phone with it's current OS. I was hoping there was a way of not having Apple force an upgrade on my tired old phone.
Thanks for the info, anyway!
coop

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