Japanese FM frequencies are lower than the Americas and Europe. Whereas in most countries FM stations broadcast between 87500 and 108000 herz, Japanese stations broadcast between 76000 and 90000. Natively the stock radio app cannot tune lower than 87500. This mod works around that and allows you to scan between 76000 and 108000.
This is a system app, so you MUST BE ROOTED TO INSTALL.
If you are on a Jellybean Touchwiz ROM, download the FmRadio file below and rename to FmRadio.apk.
If you are on a KitKat Touchwiz ROM, download the HybridRadio file below and rename to HybridRadio.apk.
I recommend first backing up and uninstalling the stock app via Titanium Backup
Copy the apk to the system/app directory using Root Explorer
Rename to FmRadio.apk or HybridRadio.apk (depending on your Android version)
Add the following line to your system/csc/feature.xml:
That should do it! You can now tune to bands below 87.5!