If you are using an old phone strictly for nostalgia, Android 7.0 Nougat is a great choice. However, if you plan to use the device as a daily driver for banking, social media, or photos, it is highly recommended to look for a newer custom ROM (like Android 10 or 11) based on (if your device supports it) or LineageOS 17.1/18.1 , as they offer much better security and app compatibility.
If you want, I can:
Famous for extreme customization options, combining features from many other ROMs. CyanogenMod 14/14.1 android 7.0 custom rom zip file download
: The most widely used ROM for Android 7.1.1, offering a stable and clean experience. If you are using an old phone strictly