A: You must flash a full stock firmware using IDT (Huawei's Image Download Tool) or Hurricane Box . This requires an authorized Huawei account. Most repair shops charge $30–$50 to unbrick a Kirin 710.
For this guide, we will use the most accessible professional method: . Warning: This process requires opening the phone’s back cover to access the motherboard test point. If you are uncomfortable, take the device to a repair shop. hisilicon kirin 710 frp tool