Pioneer (now a part of a broader restructuring) no longer supports the AVIC-DRV250. It is a discontinued product. The official service procedure would have involved a technician inserting a proprietary "Service CD" (Part number usually starting with "CRB" or "Service-250"). These discs were never sold to the public.
: Historically, these units utilize a specific DVD-ROM. The file you mentioned ( .rar ) is likely a compressed image of this physical disk, which must be extracted and burned to a high-quality DVD-R. Boot Disk Pioneer Carrozzeria Avic Drv250 Japanrar
Because these units were never intended for export, they have developed a cult following among car enthusiasts outside Japan who import them for use in vehicles like Toyota Alphards, Nissan Elgrands, or for custom retrofitting projects. Pioneer (now a part of a broader restructuring)
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Магнитола Pioneer Carrozzeria AVIC-DRV250 во Владивостоке These discs were never sold to the public