Review on Enhanced Autel AL539B OBD2 Scanner: 3-in-1 Code Reader, Battery Tester, Avometer for 12 Volts Batteries, Advanced OBDII Diagnosis and Circuit Starting & Charging Systems Test by Chip Palmer

Autel recommends upgrading your device at the time of purchase. I updated and lost the DVOM function! Wrote to Autel and here is the reply. I did an update and after that everything went perfectly! Hope this helps." Hi Christopher, AL539 will not register. Please try the update again and follow these instructions: Go to www.autel.com (top of web page) Support & Updates > Firmware & Downloads > Update Client > Download MaxiLinkII (top row, middle image) After downloading the file, open it and install the program. When the program is successfully installed, an icon labeled MaxiLink II will appear on the desktop. Now you need to Download Software Upgrade File Package Go to www.autel.com (top of web page) > Software Update Package > Download the package for your instrument ) on the desktop This step is very important Make Make sure the files are on the desktop Now open the MaxiLink II program Make sure you have selected your instrument on the left side of the program If your Inst instrument is selected, you will see an image of your instrument in the lower left corner of the program. Connect the instrument to the PC and put the instrument in upgrade mode by entering the instrument's setup menu and upgrade mode. The red box in the top right corner of the program turns green when the instrument is successfully connected and in update mode. You will now see 2 boxes in the program. One is updater window and the other is DTC update. In the first window, click "Choose File" and locate the .bin file on the desktop, select it and click "Open". NOW go to the second box below and click "Choose File" and locate, select and open the .aut file. Now you will see 2 file names in empty text files. Please click the UPDATE button in the first box and wait for the process to complete. Click "OK" when finished. Click the UPDATE NOW button in the box below. PLEASE DO NOT DISCONNECT OR SKIP THIS STEP. After this update is complete, the tool will be updated. You can disable it and let the tool load. - Hibah.