IN VHF, the maximum freqencey is up to 87 MHZ INSTEAD.
I live in Japan.In Japan, the FM band must range from 70 MHz to 108 MHz.

Your screen is a VHF screen, not an FM screen. I can also display from 64MHz if it is VHF. The FM screen is probably from 87.5MHz.

I set FM from 64MHZ in the SETUP Menu, but it still starts from 87.5MZ on the RETRO screen.

I am using ATS-25amp with version 4.2, and I would like to set the lower limit frequency of FM in retro mode to 70MHz, but the current setting is 87.5MHz. How can I set it to 70MHz?