Instructions regarding the installation of USB DAC driver:
1. Upgrade the X3 1st gen's firmware to version beyond FW2.05 as follows:
Copy the “x3.fw”file provided by FiiO to the root directory of a TF (microSD) card formatted in FAT32 and insert the card into the X3.
With the X3 powered off, hold down both the menu and power on buttons until the upgrade via TF dialog shows up on the screen.
When the progress bar to the upgrade is completed, the player will restart automatically.
Precaution: The TF (microSD) card should preferably be 32GB or smaller, and be a blank card formatted in FAT32.
Please ensure the X3's battery is sufficiently charged (preferably fully charged) to prevent failure during the upgrade.
Please do not touch the player's buttons while the upgrade is in progress. If the upgrade fails the first time,
please hold the power button for over 10 seconds to perform recovery, and repeat the actions described in this
step (1) to complete the upgrade. After upgrade is complete, please refresh the songs database.
2. After upgrade is complete, a USB mode will be added to the X3's system settings menu: DAC mode.
This is the new default. The other mode is mass storage mode (the old mode).
3. After confirming that the USB mode is “DAC”, connect the X3's micro USB port to the computer's USB port
via the prepared USB cable(for desktop computers, please connect to a rear port and not a port on the front panel),
and the X3 will enter the USB DAC interface after startup (except when connected to a windows XP computer).
Double click the in the driver package attached to this article, and the following dialog will pop up:
Use the default installation path and click Install
While the installation is proceeding, the following warning dialog will pop up more than once (usually twice).
Select “install this driver software anyway” each time the dialog pops up:
Select “install this driver software anyway”
The above dialog will pop up indicating successful installation of the driver. Click Next.
Click Finish to complete installation.
After installed the driver, set “FiiO X3” as the default audio play device.
Please refer to the following link for the detailed X3 USB DAC manual and FAQs: