How to repair a Mercedes Benz NTG5 1 headunit central display black Headunit unable to startup error

NTG5.1 and NTG5.2 Were widely installed on Mercedes-Benz S, CL, C, GLC, AMG-GTS, X-Class and the new generation Vito, A, B, CLA, GLA, W207-E, W212-E, CLS, GLE and GLS vehicles, Per dayliy repair experience, most of the problems was caused by the data crashed in the 4GB eMMC, write a good data files the failures will disappear.