Please copy the LT30TM system file to a SD card, The file should be disassambled to the SD card root storage and insert this SD card to LT30TM, Press ON+F2 KEY at the same time, it will begin to update.

Remember to follow below FAQ to foramt the SD card first:

This FAQ's front part is about how to format the SD card,
FAQ_How to update the OS of LT500 series.pdf