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procedure a) 1.get your printer ON and installed on a pc - make sure you have only ONE printer connected 2.simply double click downl1640.bat that can be found in  " ML1640 V83 FIX FIRMWARE " folder 3.you should get a amber light on the printer  4.leave the printer alone for like 4-5 minutes to make sure the update is over (or untill the green led lights up) after that turn off and back on the printer 5. now all should be OK ..check with a test page to see the counters b) 1.get your printer ON and installed on a pc - make sure you have only ONE printer connected 2.go to " ML1640 V60 FIRMWARE " folder 3.drag and drop " ML1640_V1010060.fls " over " usbprns2 " 4.you should get a amber light on the printer (solid or blinking)  5.leave the printer alone for like 4-5 minutes to make sure the update is over (or untill the green led lights up) after that turn off and back on the printer 6.go to " ML1640 V83 FIX FIRMWARE " and ...