To upgrade the Java/VM Card Download the relevant Java/VM card update file from TESSA to a laptop/PC with a SD card reader. Extract the file to a convenient location. Remove the Java/VM Card from the MFD and insert into laptop/PC. Using Windows Explorer make a note of the drive mapping allocated to the SD Card. Explore the previously extracted file and run the 'Update to xxx.bat' file, following the on screen prompts. Remove the card and reinsert into MFD. SDKs are different depending on the specific product and I would recommend RTFM.