Before you can flash a ROM, you need a custom recovery (TWRP).
The A5 2015 has several distinct flavors depending on what you value: 🚀 LineageOS (The Gold Standard) Speed and a clean, "Pixel-like" experience. samsung galaxy a5 2015 custom rom
While newer versions exist for other models, Resurrection Remix 5.8.x remains a classic for stability on older hardware like the Before you can flash a ROM, you need
While specific development for the 2015 model has slowed, these are the most common ROM families used to revitalize the device: LineageOS: Before you can flash a ROM