BP40NS20 Firmware(ver ML03) update for Mac OS. To update the firmware of the BP40NS20 for Mac OS. please refer to the following instructions: Note: Not following the subsequent update instructions explicitly will result in permanent damage to your drive, for which LG will not be responsible. This firmware update is for drives with original firmware versions below ML03 The drives must be original LG branded drives with the Blu-ray Writer model number BP40NS20(no OEM units) If you have an OEM unit, branded with another manufacturers name, please contact that manufacturer for support and firmware updates. This firmware update is for use only on PC¡¯s with Mac OS(10.6.4, 10.8.2, 10.9.3) 1. How to update firmware A. connect the drive at USB port by it self B. Please unzip BP40NS20_ML03 for Mac.Zip file on Mac OS. C. clink "BP40NS20_ML03.app" file. D. Click "Flash it!" button ¡Ø Critical Instructions: (to be followed carefully) 1. Close all other programs including: screen saver, antivirus and/or power-down programs. (If these programs are not closed, they will try to engage the PC, during the update process, thus interrupting the update and damaging the drive). 2. Check the drive to ensure that there is no disk in the tray before you start the update procedure. 3. Please never disconnect USB cable while updating firmware. 4. The update will be complete, after you reboot your system. WARNING: Do not open any programs or start any system functions during the update, as they will interfere with data transfer and damage the drive. Do not cancel the operation once it has been started or the drive will become permanently damaged, as a result.