Look for a folder named dload . Inside, it should contain a file named UPDATE.APP .
Wait for the process to complete. The phone will verify the file, unpack it, and write it to the internal flash memory. This takes roughly 5 to 10 minutes. huawei cun-l21 flash file sd card
The Huawei bootloader looks for a specific directory structure on the external storage to trigger an automatic update. Look for a folder named dload