12. How to upgrade the firmware for K19?
K19 can be upgraded with firmware, of which, both XMOS and MCU firmware need to be upgraded via PC; Bluetooth firmware can be upgraded via FiiO Control APP. Firmware is not available at the moment, and will be added after subsequent updates.
MCU firmware update instruction:
Video instruction about updating the K19: https://youtu.be/q-5kwBWNJ4E
Before updating MCU firmware for K19, please note the following:
1) You can use a Windows computer or MAC computer.
2) In addition to connecting the K19 to the computer, it is recommended to unplug all other devices or decoders on the computer USB interface;
3) During the firmware upgrade process, please do not disconnect the power supply or unplug the USB cable to avoid upgrade failure.
1. First switch the working mode of K19 to USB mode, then long press the MENU/INPUT button to enter the menu, find "Update" in the menu, select "on", and the screen of K19 will display "Waiting... .", and then connect the USB interface on the front panel of the K19 to the USB interface on the computer.
Please note:
a) Use the USB interface on the front panel of K19 instead of the USB interface on the rear panel of K19;
b) If it is a desktop computer, please use the USB interface on the front panel of the desktop computer and do not use the USB interface on the rear panel;
c) Please do not use a USB 3.0 data cable, otherwise the computer may not be able to recognize the K19. The USB 3.0 data cable is different from the USB 2.0 data cable. The inside of the USB 3.0 data cable interface is usually blue; please use a USB 2.0 data cable. It is recommended Use the USB cable that comes with the K19 from the factory.
2. Check the computer at this time. A blank USB drive letter will appear on the computer with a memory size of approximately 1.69MB. Copy the “update.bin” file (please do not modify this file name) in the "K19_MCU_M146" folder to this blank USB drive letter. The copying time is about 20 seconds. When the file copy is completed, you can right-click the USB drive letter and select "Eject".
Note: Do not unplug the USB cable directly, and do not click the eject button in the lower right corner of the computer, otherwise the K19 will not enter the upgrade state.
3. At this time, K19 will automatically enter the firmware upgrade state, and the words "Updating..." will be displayed on the screen. During the process of upgrading the firmware, please keep the K19 powered normally, do not operate the K19, and do not turn off the power. The upgrade process will last about 30 seconds. After the upgrade is completed, K19 will automatically restart. After that, you can see MCU M146 in the "Version" in the K19 menu, which indicates that the K19 MCU M146 firmware upgrade is successful.
