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I've seen phones with the MediaTek MT6750t CPU that can access the GSM frequency bands 850/1900, but the k8000 doesn't come with them. The mediatek website also says this CPU can access all frequency bands so it must be possible. How can I unlock these bands for my k8000? Thank you.

The SOC as little to do with the frequencies these days. All modern SOC can normally access all bands. The issue is the radio specs which are normally hard-tuned.

In other words, there is nothing that can be done about it.