Updating the firmware on an Easyl is a fairly easy process. Connect the Easyl to a computer via micro USB; it should automatically detect and open as a flash drive.
Copy your latest firmware BIN to the Easyl device (EZ03V111.bin for Easyl Touch, EZ02V111.bin for Easyl Pro are the current builds).
Eject the Easyl from the computer, then disconnect the wire.
The device should immediately begin upgrading the firmware. It is imperative that it retain power during this process. When it is complete, it will return to the Easyl logo screen.