We get the newest stock firmware for iMito MX1, Here is the firmware download link:
Fix system freezen when you use HomeMediaCenter;
Update NAND FLASH DRIVER,update bootuploader.
The flash tool and driver is also in the download file.
If you have updated the new firmware release on 06th Nov, then you can directly use Micro SD card to update, just copy the Img file to the micro sd card,and then insert the card to MX1, and the system will inform you there is a new firmware update, and just click Yes, to finish the update.
If you upgrade the system from the original firmware: then you should try to flash the firmware with the tools, instruction is here: