To recover a dead or bootlooping Motorola Moto M (XT1663) using Android 7.0 stock firmware, you must Smart Phone (SP) Flash Tool
For Boot Loop / Sign Care Errors:
Most users flash firmware to fix a lagging phone or to bypass a pattern lock. However, this specific "Dead Recovery Sign Care" file serves a more critical purpose. To recover a dead or bootlooping Motorola Moto
Install the MediaTek USB VCOM Drivers on your PC. Without these, the SP Flash Tool will not detect your Moto M during the flashing process. Step 1: Install Drivers Install the MediaTek USB