AC MAX Smart AC Charger Firmware Library Please download the latest FWs from following links V01.26.27.00 Release Note V01.26.29.00 Release Note V01.26.31.00 Release Note V01.26.34.00 Release Note Firmware upgrade procedure can be found in section 3.5.1 of installation manual. NB unzip the file before uploading and do factory reset after firmware upgrade