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.

[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.