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onda v819 4G recovery menu missing

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Hi all,

I have one of this tablets and have some troubles with it.

Something happened and it cannot boot. In fact it boots and shows the lockscreen for a second and reboot itself.

I try to enter recovery menu but there isn't any.

only calibrating mode and fastboot mode.

How can I enter recovery menu in order to do a hard reset?

Thank you in advance!!!

p.s.

I tried with brushtool but it did not connect as it should. 

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