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Oh, you edited your first post to .210 instead of .310. From .210 you can downgrade the same way as you update to .335.
Only at .310 or higher you can not use the usual downgrade process to downgrade lower than .310.
 

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Hạ cấp bình thường, tôi đã thử .310
Try to comment in English my friend, they cannot understand your Vietnamese local language!
Downgrade CMU with firmware version 74.00.310 to lower version is very risky, if you got problem on downgrade process your CMU totaly bricked and cannot recover anymore... will need to replace CMU...
Becarefully with it!
 
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