Hello Tuananh1987,
You can certainly go ahead and update the BIOS version to A06. It would not affect the copyright of Windows 7. The latest version A06 was released for enhancing the system stability.
**NOTE: Few things to ensure before updating the Bios is, the Ac Adapter should be plugged in and the battery should have minimum of 15% charge. No other external peripherals should be connected to the computer. Please ensure that the Bios update should not be interrupted else it would damage the motherboard.
Please write back for further queries.