Dear Customer, Please Note That Activation Is Required Before Use And There Is No Need To Refresh The Firmware (we Already Installed The Latest Version Of The Firmware When Sending It Out). Once Received, Only Activation Is Required And There Is No Need To Refresh The Firmware. Please Note! Kmbox B+version(b+is Suitable For Dual Computers). The B+version Is Pro, And The Dual Computer Is That The B Computer Controls The A Computer. The Software Runs On The B Computer, And The A Computer Does Not Open Anything. The B+serial Port Is Connected To The A Computer, Which Is The Same As The B Version. This Is A Stand-alone Mode. Where The Serial Port Is Inserted, The Serial Port Driver Is Installed. Install The Ch341 Drive, Or Install Wizard For Automatic Installation. This Version Is An Upgraded Version Of Kmbox B. The Main Differences Are As Follows: Separate The Communication Serial Port From The Keyboard And Mouse, Which Can Easily Realize Dual Computer Control. (usb Receiving Computer A, Usb2 Is Connected