Settings/Search:
####0000# : Display version info
####1111# : factory test log (Service Test)
####2222# : Display SN
####3333# : offline log (LenovoLogger)
####3334# : open all offline log
####3335# : close all offline log
####5993# : Display internal frameWork version (incl. Regional Code)
####6020# : Set Regional Code (Does Factory Reset)
####6030# : Auto Set Regional Code if "countryCode" present, else set Regional Code and "second_ccode" == "true" (Does Factory Reset)
####7777# : Factory reset
####8375# : Baseband version info
####33284# : Debug set

####025160# : turn off lte sar
####025161# : turn on lte sar
####025162# : turn off wifi sar
####025163# : turn on wifi sar

Generic:
*#*# ... #*#* == android_secret_code:// ..