: Specifically usbloader-5573cs-322.bin and the universal update E5573cs_Update_21.318.09.00.00 .
While specific steps vary by firmware version, most "power user" methods follow this path: Dismantle and Bootshot huawei e5573cs-609 unlock firmware download
For many locked versions (like those from Airtel), a "bootshot" is required to bypass security. : Specifically usbloader-5573cs-322