After years of combing through forums (Minkara, Type-Zero, and AVIC411), a dedicated group of JDM importers released a "Version 2.0" of the translation. This is the manual you need. Here is what it contains that the cheap copies do not:
The single biggest complaint about the AVIC-RZ500 is the maps. The stock unit has a 20GB HDD (Hard Disk Drive) loaded with data for Japan only. Pioneer Carrozzeria Avic-rz500 English Manual BETTER