Edu09 Calibration error

Hello,
I just bought edu009 and i have a problem with calibration…

It sais calibration failed with this error

CH1 offset at 2V/div : 77 FAIL
Rounds : 51
CH1 offset at 1V/div : -46 OK
Rounds : 51
CH1 Y-position low, CH1_DAC1 255 0
Rounds : 33
CH1 Y-position mid, CH1_DAC0 255 77
Rounds : 51
CH1 Y-position high, CH1_DAC2 255 173
Rounds : 51

Hope someone can help me fix this…

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