For the Redmi A5, a good Free Fire sensitivity setup to start with is:
General: 172 Red Dot: 157 2x Scope: 142 4x Scope: 127 Sniper Scope: 112 Free Look: 18 DPI: around 320
These settings are a good base for headshots, but sensitivity can vary depending on your playstyle, so test it in Training Ground and adjust the General sensitivity by small increments.
Full Redmi A5 sensitivity settings and explanation: https://www.freefiremania.com.br/sensitivity/redmi-a5.html
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