PSP with official firmware (not CFW) upgraded to 6.20. How to downgrade without a Pandora?

PSP with official firmware (not CFW) upgraded to 6.20. How to downgrade without a Pandora?

I recently bought a PSP and as soon as I bought it, I upgraded it to 6.20. My Psp does have official firmware and not custom firmware. I want my Psp to have a 5.10 or lower, maybe even 2.10 or 3.01. If I buy a new psp battery pack (not a Pandora) and put it inside my Psp, will my Psp be lower than 6.20 because of my Psp having a completely new battery pack inside of it? Will this be a special way of losing my 6.20 version of my Psp?

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