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By the serial number on the back, it is a K2 (US - Sprint Network).
"Tried to update twice but failed"
How did it report the failure? I.E: Did it give any specific error code?
According to my collection of Amazon firmware releases, that firmware build number was never a production release.
So try to update to version 2.5.2 (490480060) first, not try to jump directly to 2.5.8
If that works, then you may have to also install each release in order:
(no 2.5.3), 2.5.4, (no 2.5.5 or 2.5.6), 2.5.7, 2.5.8
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