Here are the most stable and feature-rich custom ROMs available. Links to XDA/4PDA threads are recommended for downloads.
The Lenovo A5500-HV runs a chipset. Unlike Qualcomm devices, MediaTek does not release full kernel sources. This means: Lenovo A5500-hv Custom Rom
Here are some popular custom ROMs available for the Lenovo A5500-HV: Here are the most stable and feature-rich custom
While specifically demonstrated on the similar A3500H model, similar custom ROMs often exist for the through community portals like the XDA Developers forum. General Installation Process Lenovo A5500-hv Custom Rom
Here’s a ready-to-use social media / forum post for the (also known as the Lenovo Tab A7-10 A5500-HV).
At least 60% to prevent shutdown during the process.