Your subject title indicates Rocket II (5500-1) but your question says 5500
not 5500-1. They are different. I will assume Rocket II (5500-1)
Software and error messages for 6000-1 (anniversary legend) and certain
Nostalgic, CD-4, CD-6 and CD-8's are the same as the Rocket II. You need
manual for S-6A electronics. They are black in color. Try Victory Glass. Be
careful, there are earlier versions of the CD-x and nostalgic which use S-5A
and are black also. The software is different and may not have the same
error codes. There is also original CD based Rocket and Legend (6000) models
which use the S-5A black electronics.

Greg

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Do you still have manual for the 5500?