I have had my ender 6 less than a year, and although they are still being shipped with the V4.3.1, they are not as described. The drivers are a mixed set, X and y are tmc2208 and extruder and z are a4988

@stu-3d flash board firmware on big SD card in slot behind screen first, then put the screen firmware on micro SD, remove the LCD and put into slot on the LCD board and flash, should resolve your issue

just an update for you guys, they are still shipping ender 6 with v4.3.1