For hard bricks (no recovery, no fastboot), you need the Huawei IDT tool and a USB-to-UART or test point cable.
For the STK-LX3, the most recent official firmware versions typically end with builds like 9.1.0.278(C461E4R3P1) or 10.0.0.240(C461E5R2P1) depending on the region (C461 = Latin America open channel). Firmware Huawei Y9 Prime 2019 Stk-lx3
After a factory reset without removing the Google account, the device asks for a previously synced account. Flashing a specific FRP firmware version can bypass this. For hard bricks (no recovery, no fastboot), you
: Powered by the HiSilicon Kirin 710F octa-core processor. 2. How to Update Your Firmware (STK-LX3) For hard bricks (no recovery