To enable download mode on an MTK device, usually one needs to use a combination of hardware buttons on the device or establish a connection to the device's internals through test points. To enter download mode on an MTK device using test points, you will need a specialized tool such as a JTAG debugger or a USB-serial converter, as well as knowledge of the device's board and test point locations. Once you have these tools and knowledge, you can use the test point to establish a connection to the device's internals, then use specialized software on your computer to flash the firmware or other updates for the device.
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Samsung