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Which instructions did you follow? The procedure for downgrading to an older firmware version is different to the one for upgrading to a newer version.
(I think to downgrade from 2.6.x or later to 2.5.x or earlier you will need to do a factory reset first, then upgrade from the factory firmware to version 2.5.x, without loading 2.6.x/2.8.x inbetween.)
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