The most significant risk is "bricking," where the device becomes permanently non-functional due to an interrupted or incompatible firmware installation. This often occurs if the power is lost during the process or if the firmware version does not exactly match the hardware revision.
Short-circuit this test point to the ground shield using tweezers. While holding the short, plug the USB cable into the PC. ZONG E5573CS-322 21.323.01.00.306 DIRECT FLASH.7z