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Which strongly suggests you loaded the wrong firmware. E.g., loaded Rep 2 or Rep 2X firmware on an Asian clone printer which merely looks like a Rep 2 or 2X but isn't.

However, this is not a support forum. Please find the support forum appropriate to your printer and post there for help. On groups.google.com, there are forums for WanHao, FlashForge, and CTC printers. Likely for the MBot3D as well.