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ok, here's the update,
I contacted both jetbook tech support and Doc.E tech support(jetbook is Doc.E's North America version). They put in version check in 0.34, the reason is when customer try to upgrade their firmware, many of them happen to choose a wrong one(for other model) and brick their device.
So you can not downgrade from 0.34 to lower version. but you can downgrade from any higher version to 0.34(coz version/model check is enforced in those versions already).
The bottom line is if your device is 0.33, you have one time choice to choose which line of firmware you wanna follow. otherwise you are binded to current firmware line. The only hope is some one come up with a crack release.
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