Help Please

Hi desperate for help,
I have a Clarion Radio
I think first letter of serial is damaged so it reads
serial: P3001MB0011218
Clarion: PP-3001M
type: PN-3000
Nissan part no: 28185 BG10A
every serial I have seen for the Nissan starts with BP but if this one starts BP then it makes it 15 letters long instead of 14.
The model number is PP-3001M so presumably the serial should be PP3001MB0011218.
Can anyone make sense of this please?
On further searching I think this is the same radio as fitted into the Nissan Note, in which case the longer serial seems to apply ie PP3001MB0011218.
Still need help with a code though please.
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