Secret codes for Samsung Galaxy A8 Duos
*#*#4636#*#* - full information about tablet
*#*#7780#*#* - factory reset data default
*2767*3855# - tablet format
*#*#34971539#*#* - phone camera update
*#*#273283*255*663282*#*#* - copy files (the backup created)
*#*#197328640#*#* - service mode
WLAN, GPS and Bluetooth Test Codes
*#*#232339#*#* OR *#*#526#*#* OR *#*#528#*#* – WLAN test; *#*#232338#*#* – Shows Wi-Fi MAC address;*#*#1472365#*#* – GPS test; *#*#232331#*#* – Bluetooth test; *#*#232337#*# – Shows Bluetooth device address.
Firmware version information
*#*#44336#*#* – PDA, Phone, CSC, Build Time, Change list number; *#*#2222#*#* – FTA HW Version; *#*#1111#*#* – FTA SW Version, *#*#1234#*#* – PDA and Phone*; *#*#4986*2650468#*#* – PDA, Phone, H/W, RFCallDate.
Factory Tests
*#*#3264#*#* – RAM version, *#*#0*#*#* – LCD test, *#*#0842#*#* – Device test (Vibration test and Backlight test), *#*#2663#*#* – Touch screen version, *#*#2664#*#* – Touch screen test; *#*#0588#*#* – Proximity sensor test.