and similar automotive electronics specialists offer SD card-based English patches for the CN-R500D. Self-Service:

He didn't give up. He found an online forum where a user named "JDM_Master" had posted a guide. Since the firmware couldn't be toggled to English, the trick was learning the "muscle memory" of the Japanese layout. The Main Menu:

Look for メニュー (Menu) on the physical device or screen.

Most CN-R500D units were manufactured for the Japanese market. In these units: