[UNLOCK][ROOT][TWRP][UNBRICK] Fire TV Stick 4K (mantis)

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NOTE: There have been multiple reports of devices with serial numbers containing VM190 or higher being shipped with DL-Mode disabled in BROM.These devices cannot be unlocked using kamakiri.These devices do not show up at all on USB when shorted.After the old bootrom-exploit (amonet) we've been using for unlocking all these Fire-gadgets is closed in more recent Mediatek SOCs like the one used in the FireTV Stick 4K, @xyz` has done it again and found...Read more