Zoom F8n Operation Manual page 160

Updating the firmware
Checking the firmware version
7.
Use to select
Version
, and press
160
(continued)
Firmware
.
Updating the firmware
7.
Update
Use to select
Firmware
, and press
8.
Yes
Use to select
and press .
NOTE
Do not turn the power off, remove an SD card or disconnect the
USB cable during an update. Doing so could cause the
become unstartable.
9.
After the update completes,
turn the power off.
.
,
to