Lenovo A5500-HV (MediaTek MT8121/MT8382, 1GB RAM, 7" 1024x600) Original OS: Android 4.2.2 Jelly Bean (later updated to 4.4.2 KitKat officially)
While specific links change over time, these are the types of ROMs generally available for this model: Lenovo A5500-hv Custom Rom
Best for users who want every possible customization toggle. It combines features from several different ROMs. Lenovo A5500-HV (MediaTek MT8121/MT8382