Znalazłem trochę kodów serwisowych:D  jeśli ktoś lubi "pogrzebać" w ustawieniach fabrycznych to może sie pobawić. Tylko dokładnie czytajcie co ustawiacie bo możecie uśmiercić fonika na dobre:D
na moim i9+++ aby wejśc w ustawienia fabryczne pasował kod: *#36*#

U Was w zależności od modelu może być troszkę inaczej...



Engineer mode - While in this mode you can change many of the phone's
default settings, but be careful, you can also brick your phone.
The most common Engineer mode codes for current models are these:
*#82043036#
*#3646633#
*#010101*#
*#666# (note:seems to work on phones that use *#777# for Factory mode, and *#555# for Version Summary)

Factory mode - In this mode there are also some tests & settings. In this mode
you can also find out more detailed information than just version information,
like what processor chip (CPU) the phone has in it, usually under the BB chip menu,
and some other hardware/software on the phone version numbers.
The most common Factory mode codes for current models are these:
*#66*#
*#66#
*#36*#
*#258#
*#777# (note:seems to work on phones that use *#666# for Engineer mode, and *#555# for Version Summary)


The most common IMEI number showing mode code for current models is this:  *#06#

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Service codes "Chinese" models:
default user code: 1122, 3344, 1234, 5678
Engineer mode: *#110*01#
Factory mode: *#987#
Restore factory settings: *#987*99#
LCD contrast: *#369#
software version: *#800#
software version: *#900#
set default language: *#0000# Send
set English language: *#0044# Send
set English language (new firmware): *#001# Send