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*#800# – Enter engineering mode *#801# – Engineering switch test mode (dangerous) *#802# – enter automatically engineering TTFF GPS test mode *#803# – enter engineering network test mode *#804# – automatic disconnect test mode *#805# – engineering Bluetooth test mode *#806# – engineering aging test mode *#807# – enter engineering test mode *#808# – enter manual engineering test mode *#809# – enter engineering echo test mode *#888# – view hardware pcb version *#900# – test photograph RGB *#06# – view this machine mobile communication international recognition id *#99# – screen lights long bright *#6776# – machine info *#1234# – view software details ` *#36446337# – test function instruction