, but the final updates remain available on their legacy product page. Always download firmware directly from Onkyo’s website – avoid third-party sites. Last checked: Onkyo still hosts TX-NR646 firmware at their support portal under "Archived Products." If the official page is inaccessible, use the USB method with known-good file hashes from AV community forums.
, but the final updates remain available on their legacy product page. Always download firmware directly from Onkyo’s website – avoid third-party sites. Last checked: Onkyo still hosts TX-NR646 firmware at their support portal under "Archived Products." If the official page is inaccessible, use the USB method with known-good file hashes from AV community forums.
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