With the release of AM5 to the market, FiiO provides this FW1.91 to well support this new amplifier module.
Pls kindly note that the FW1.91 was upgraded on the basis of FW1.8, and it only added supporting function to the high-power type module AM5. So for X7 users that don't have AM5, there is no need to upgrade to FW1.91 when you get push notification.
X7 FW 1.91: >> Download Address
X7 USB DAC Driver + installation tutorial: >>Download Address
X7 DLNA Usage Guide: >> Click here
FiiO Electronics Technology Co., Ltd.