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Cool on display board you can see USB connector, also U3 maybe it is memory for store resource. In any way need do reverse engenering for understood how it works. May be rewrite frimware on clear marlin it will be bad idea, because only China know how works it board. I see that it board not a http://www.ebay.com/itm/2-8-MKS-TFT28-LCD-Display-V1-3-Touch-Screen-for-3D-Printer-Ramps-V1-4-MKS-Base-/262595088810 because I know that mks tft28 support marlin by uart, but all resource for display stored on display module and on original module we have sd card for rewrite resources for display