The is a specific system update primarily found pre-installed on newer units of the H1n Handy Recorder . Key Characteristics of v1.21
: Keeping the device current "crushes" persistent bugs that could otherwise lead to data corruption or connectivity issues. How to Update Your Zoom H1n zoom h1n firmware 121
Keeping your firmware current ensures your recorder remains compatible with modern microSDHC cards (up to 32GB) and functions reliably as a USB audio interface for PC, Mac, or iOS devices. Zoom H1n firmware version 1