default user code: 1122, 3344, 1234, 5678 Engineer mode: *#110*01# Factory mode: *#987# Enable COM port: *#110*01# -> Device -> Set UART -> PS Config -> UART1/115200 Restore factory settings: *#987*99# LCD contrast: *#369# software version: *#800# software version: *#900# set default language: *#0000# Send set English language: *#0044# ... Read More