This is the information that I get scrolling through the self-test menu at ext 1416:
↓1416 Rel [40.0]
SW vintage [09]
Bootloader U[25]P[00]
Lng lng_R10_v11_Pack01
Is there a way to upgrade the firmware on the phone to R55 / 15 directly without going through an IP Office?
no, the firmware is provided by the IP Office the phone is connected to.
if your IPO is old then your firmware on the digital phones is matching and also old.
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