Do not install heavy background apps. Clean cache data regularly via the pre-installed native files management app to prevent memory-leak loops on the 2GB system memory. Blade A51 - ZTE - Support

Turn off localized scanning features. Go to > Location > Wi-Fi and Bluetooth Scanning and switch both sliders off. This minimizes background processor polling cycles. Limit Animation Scale Settings

Infected custom ROMs run hidden crypto miners or aggressive adware. This spikes the chip temperature instantly. Essential Pre-Flashing Checklist