I have an Easun smw 11kw with a removable display. I have 64/09. I tried to upload 64.62 from a USB pendrive. After about 10 minutes, the display returns to the main menu and freezes. nothing can be switched. I have to turn the inverter off and on but the software is still old. what am I doing wrong? Should there be only the "dsp.hex" file on the pendrive? or some other file?