Latest firmware update version can be downloaded from Metrel download page;

Instructions how to upgrade instrument with new firmware.

1. Unzip files
(Use WinZip software.)

2. Run FlashProgrammer.exe
- connect PC to instrument with serial cable
- select COM port serial cable is connected to
- disconnect charger if connected
- on instrument hold down ESC and FUNCTION_RIGHT keys and turn ON the instrument (or connect charger).
- press START button on PC-SW
- wait until processor is programmed