REC ERROR is displayed, and the MASTER REC button is rapidly blinking.

This error is displayed when the writing process fails, or when the writing-disabled USB device is connected. The display of this error may depend on the specifications and performance of the USB device. Therefore, if the error is displayed multiple times, it is recommended to use another USB device.
The same message is displayed when you attempt to record on the iPhone, iPod or Android device connected to the unit. (Recording on the iOS/Android terminal is not possible.)

The rapid blinking stops when the MASTER REC button is pressed again.