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There is no single official "MT6753_DA.bin" from MediaTek for public download. Instead, legitimate DA files are extracted from: Mt6753 Da File
A for the MT6753 chipset is a critical binary component used by flashing tools (like SP Flash Tool or Miracle Box) to communicate with the device's internal storage during low-level operations. If this post helped you unbrick your device,
Set up the eMMC/NAND storage for data transfer. Mt6753 Da File