2.What should I do if the K11 is abnormal?
[No sound, noise, unable to boot, indicator light off, etc.]
You can try the following methods to help you solve the problem:
1. Restart K11;
2. Re-plug the power cord.
How to restore factory firmware for K11? (K11 comes with backup system. When you meet the system failure (for example fails to enter menu), you can try to restore the factory firmware via the backup system.
1.When K11 is powered off, long press the knob to turn it on. Keep holding when 'FiiO' shows and stop holding when the screen turns off. The display will shows 'bACkUP' and you can enter the backup mode.
2.In the backup menu, click the knob to enter the selection menu, then scroll the knob to select between REVERT/UPDATE/RETURN options.
When selecting 'REVERT', the system will restart and enter the backup system (i.e. factory firmware system). At this time, the system will overwrite the system with part of the code of the backup system, and then restart automatically. Then the basic backup system becomes a normal available system. (Nomater the normal system fails or not, after selecting 'REVERT', the original system will be overwrited with the backup system)
When selecting 'UPDATE', the system will enter the MCU update mode, the display will show 'RETURN'. You could exit the mode after updating.
When selecting 'RETURN', the system will have no operation and restart automatically.
[Over-current protection]
K11 doesn't have overload, over-temperature protection mechanisms but only over-current protection mechanisms.
After the protection is triggered, you must turn off the power to restore it. You can turn it off and then on through the knob, or directly unplug the power supply to restore it.
The over-current protection is to prevent the machine from damaging the earphones. If it keeps triggering and then triggers again soon after recovery, it means that the device has a rare problem and needs to be returned to the factory for repair. Please contact the seller or support@fiio.com about that.
