LG KE590 Service Manual page 105

5. Downloading Software
5.2.2 In case of using the PIF( MON Port)
a. Preparation
- Target Handset (KE590)
- PIF
- RS-232 Cable and PIF-to-Phone interface Cable
- Power Supply or Battery
b. IBM compatible PC supporting RS-232 with Windows 98 or newer
If you use battery, you should have a battery with the voltage above 3.7V.
LGE Internal Use Only
KE590
KE590i Handset
PIF
POWER SUPPLY
PC with RS-232
4V
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Only for training and service purposes