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Cheers.
I'd wait, though, for a later 3.40 version or get 3.10OE-A'
If you want to do it manually, use the downgrader on that link to go back to 1.5, then upgrade with any link to 3.40. It's not that much harder than using the winstallers.
> Is it an installer?
You have to follow the guide in the readme, have you ever installed a custom firmware before?
Cheers.