Fastboot commands not working?

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Senior Member
Jan 19, 2013
I have a G6 H872 from T-mobile, with an unlocked bootloader.

For some reason no commands other than unlocking the bootloader work, and I can't flash TWRP.

I get an error saying remote: unknown command. I've tried different usb ports, different cords and different computers, all return the same error.

Is there a fix for this?
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