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According to the manual:
1. Flip the switch on the KSU from "SET" to "PROGRAM"
2. Dial 99 on the first extension - "ALL CLEAR?" will be displayed
3. Press "STORE" to clear system

EDIT: Sorry, that was for the KXT308. I'm not seeing the method if you don't have the programming password for a KXTD308... I'm kind of thinking a factory reset involved connecting to the serial port and running some commands from there. However, I might be thinking of the voicemail!

I have a KX-TD308 that I could use for a testbed for antique phones. I'm more familiar witht he TA series. I don't have the password, which was apparently changed from default. The reset button does not get me back to default. I see no hidden hard reset button, although there is a mysterious jumer by the coin battery.
Is there some way to do a hard reset on the PBX, to clear all programming? Or possibly is the reset button just defective? TIA. -- Alan