A: Yes, when used correctly. Download it from reputable sources. Using wrong firmware can permanently brick your device.
If you own a budget or mid-range smartphone from brands like , chances are your device runs on a MediaTek chipset. The "MT65xx" family (specifically MT6572, MT6580, MT6582, MT6592, MT6753, etc.) powers millions of Android phones worldwide.
If you see an Android lying down with a red triangle (says "No Command"), tap the Power Button once, or press Power + Volume Up quickly to reveal the menu. Inside the Recovery Menu: Volume buttons to scroll and the Power button to select. "wipe data/factory reset." Confirm by selecting "Yes — delete all user data." Once finished, select "reboot system now." Method 2: The "Chinese Recovery" Menu