These codes have been tested in a few Chinese mobile phones with success and these codes may also work in almost all other Chinese cell phones.
Enter into Engineering Mode: *#110*01#
Enter into Factory Mode: *#987#
Restore Factory Settings: *#987*99#
Check Software Version: *#900# OR *#800#
Default User Codes: 1122, 3344, 1234, 5678
Change LCD Contrast: *#369#
To Enable COM Port: *#110*01# -> Device -> Set UART -> PS Config -> UART1/115200
Codes to Change Screen Language:
*#0000# + Send:set Default Language
*#0007# + Send : Set Language to Russian
*#0033# + Send : Set Language to French
*#0034# + Send : Set Language to Spanish
*#0039# + Send : Set Language to Italian
*#0044# + Send : Set Language to English
*#0049# + Send : Set Language to German
*#0066# + Send : Set Language to Thai
*#0084# + Send : Set Language to Vietnamese
*#0966# + Send : Set Language to Arabic
*#002# – Full Factory Reset
*#87# or *#88# – Phone Test
*#06# – Shows IMEI of Mobile Phone
*#8375# or *#8376# – Software/Hardware Info
*#3641# – Engineer Mode (If you change hidden settings, do it wise)
*#3696# – Firmware USB Update Mode (Don’t install wrong firmware)
*#06# : it displays phone imei number
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