Once the update starts, do not unplug the power . Interrupting a firmware flash will corrupt the system partition, requiring advanced hardware tools (TTL/Serial cables) to fix.
Always keep your serial cable handy, and never trust a firmware file that doesn't include a checksum. Good luck, and may your bootloader be ever unlocked. Huawei Stb Ec6108v9 Firmware Update
This is the simplest method and is recommended if your set-top box (STB) has a stable internet connection. Once the update starts, do not unplug the power