Oki OkiLAN 6120e User Manual page 27

Section I - Hardware Installation
LED Display
The red and green indicators are alternately flashing for
longer than two minutes.
Problem
The OkiLAN 6120e is in firmware download mode.
This means it is waiting for new firmware to be sent
before it will continue functioning normally.
Solution
If the OkiLAN 6120e was purposely put into firmware
download mode, finish the download with the proper
update utility. Contact our web site at
http://www.okidata.com to download the utility.
OKI OkiLAN 6120e User's Guide I - 17