How to Unlock All or Specific LTE Bands on BLU R1 HD (for International Use)ALL MTK

Hello All
I cannot find guide to Unlock Lte bands on MTK devices.
I have blu r1 hd , rooted , unlocked boot loader

and unable to use lte here , so want to unlock LTE (2300/1800/850MHz) Bands,,,pls hep me thank you


sorry for my bad English


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