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Shimano E8000 firmware downgrade help


Jun 27, 2022
Norfolk UK
This might be a dead easy answer but I’m looking to downgrade my firmware on my Shimano E8000.

Bike: YT Decoy 2019

The firmware is on 4.9.3(motor) / 4.1.0(display)

I’ve read downgrading it to firmware 4.8.0 I’ll be able to change the location from EU to USA.
And obviously obtaining a licence for ST Unlocker.

I know someone who has a PCE1 which is more reliable right?
But what’s the process to downgrade,
Do I download the 4.8.0 firmware and change the name to a higher firmware than I’m on?

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