2. MCU Upgrade Preparations and Reminders Stuffs to be prepared before software upgrade 620@@MCU.rar Micro SD Card (TF Card) Upgrade Procedure Copy “620@@MCU” folder into an empty Micro SD card Car AV System 620@@MCU.rar (MCU Upgrade file) Extact the 620@@MCU.rar to get a “620@@MCU” folder, copy this “620@@MCU” to an empty Micro SD Card (TF Card). Micro SD Card(TF Card) 620@@MCU.rar 620@@MCU Micro SD Card (TF Card) Upgrading After insert Micro SD Card (TF Card),you must restart the Car AV System, it will be pop up a advisory message to select and confirm upgrade. Format the Micro SD Card in case any hidden files, then extract the file and copy it to an empty Micro SD Card (TF Card) Car AV System 1. During the software updating, the Car AV System must be kept in POWER ON status, otherwise it may cause permanent damage to the unit. 2. Taking out the Micro SD card(TF Card) during the software updating is NOT allowed . It takes about 1 minute to upgrade, The Car AV system must keep Power on status. Insert Micro SD Card (TF Card) Upgrading MCU upgrade successfully After upgrade OK, you must take out the Micro SD Card (TF Card), and then restart the Car AV System. Upgrade ok Take out Micro SD Card (TF Card) 1