You can download the Lenovo TB3-730m DA File (Boot File) directly from this page. The package is provided in a ZIP format and includes the DA file, USB driver, and a step-by-step tutorial.
This DA (Download Agent) file allows you to flash or write stock ROM, as well as unlock MediaTek-powered devices. It can also be used to remove Factory Reset Protection (FRP) lock. The file is compatible with multiple tools, including SP Flash Tool, SP MTD Tool, CM2 MTK, and other MediaTek-supported utilities. The DA file is an officially released build.
Lenovo TB3-730m Custom DA File (Download Agent File)
The DA (Boot) file is designed to work with secure boot type MediaTek-powered smartphones and tablets. It enables you to perform advanced operations such as flashing, unlocking, and also helps resolve DA error issues on supported devices.