My dad gave me the Razer Viper Ultimate for my birthday and I have been using it for a while now but I never thought to use the side buttons, so when I try to use the side buttons they don't work. the only button that works is mouse button 4 on the left side. mouse buttons 5 on the left, and mouse buttons 5 & 4 on the right side are unresponsive wired, and wireless. I have also done the firmware update for the Razer Viper Ultimate and that didn’t solve the issue.