Help! Stuck at my Acer A210 bootlooader screen

It is hang on acer logo and in left top corner is: bootloader version ISC-MR1-b05547a (unlock mode)
I can't communicates with tablet via USB (no device found) even I can't get to recover mode.

P.S I was trying to root my device using this instructions:

Than this happaned. Please someone help me!

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