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Old April 30th, 2012, 02:29 PM   #7 (permalink)
ylexot
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Apparently this works for rooting .21:
Wolf's ultimate flash and downgrade guide (NO ROOT NEEDED) (root opportunity for .21) - xda-developers

Basically, you downgrade to .15, root that, use OTA Root Keeper, and then update to .21 and restore root.
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