Question edited for clarity.
Answered in this link
https://www.fixya.com/support/t26740836-convert_clarion_max7700_from_japanese
But with some you have to download new Firmware. Some are manufactured for the Japanese Home market and only come in Japanese with no way to change.
There is a trick. Use a Smartphone with the Google Translate App and use the Camera Feature to translate what you are seeing onscreen. Look for Settings / Language.
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