If your phone is stuck in a boot loop or won't turn on, use this PC-based method.
Back up all data before proceeding, as flashing will erase the device's internal storage.
Power off the phone, insert the SD card, and press Volume Up + Volume Down + Power simultaneously until the update process begins. Method B: SP Flash Tool (For Bricked Devices)
Download and install official firmware for the Huawei G610-U20 (Ascend G610)