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(2) Turn on the GL820 to display the menu below.
And then select the upgrade program file by using the [UP Arrow] direction key or the [Down Arrow]
direction key.
(3) Press [ENTER] key to execute the upgrade.
(4) Wait until the display shown below appears or until the beeper sound stops.
Note:
Don't turn off the GL820 until this process is finished.
The following message will appear on the GL820 display in yellow characters when the upgrade is
complete. Also the beeper will sound for 5 seconds.
"Please Turn Off the Power.
GL820-UM-251-9370
I have locked up."
2-2
2. UPGRADING THE FIRMWARE
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