until the Fastboot logo appears. Connect it to your PC via a high-quality USB cable. Flash the Firmware Mi Flash Tool to detect your device. and browse to your extracted ROM folder. "clean all" at the bottom. Do NOT select "clean all and lock"
: A physical power button that is stuck can cause an endless reboot loop. Try tapping the button area or removing any case that might be pressing it. Battery/Power how to unbrick poco m5s