Ensure the MediaTek VCOM Drivers are correctly installed. Without them, the PC won't recognize the MT6737 hardware even with the correct DA.
An optimized variant for specific regional carriers. How to Use the MT6737 DA File in SP Flash Tool mt6737 da file
The standard version often found in entry-level 4G phones. MT6737T: The "Turbo" version with higher clock speeds. Ensure the MediaTek VCOM Drivers are correctly installed
Click 'Download', power off your device, and connect it to the PC while holding the Volume Down or Volume Up button (depending on the model). Common Troubleshooting power off your device
Some newer MT6737 devices require an "MTK Auth Bypass Tool" to disable the security handshake before SP Flash Tool can communicate with the DA.