unable to update my kindle dxi to 2.5
hi all,
I just don't know why I am not able to update my dxi to 2.5.
I download Update_431100003_472900057.bin to the kindle's root.
my current firmware is 2.3.3(431100003).
but the "update" item in the setting keeps gray.
anyone helps me? what's wrong or missing with steps?
thanks
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