There are 3 different password options on these radios:
Read password, radio can only be read with a password. Radio can be written without a password
Write password, radio can be read, but writing new programming file requires a password.
Read/Write password, radio can only be read and programmed with a password.
So, answer is….
I take it you've tried to read the radio and it wanted a password. Have you attempted to write a file to the radio?
If it's got a write or read/write password, the correct answer would be "send it to Kenwood".
The non-PC answer is that DEPENDING on the firmware/software, there is a way to bypass the password with an engineering key for the KPG-141. But don't ask for it from me.