После замены дисплея как исправить контрасность?

[Drim]

Есть наболевшая тема, при замене дисплея а невсегда он точь в точь как родной, контрасность либо завышена либо занижена.
Есть ли у сих чудо мобайлов регелировка в прошивке, епроме и за что он у них вобще отвечает?
также интересует громкость динамиков.

[Maxmobile]

*#66*# Set Factory Mode CONFIRMED
*#8375# Show Software Version CONFIRMED
*#1234# A2DP ACP Mode CONFIRMED
*#1234# A2DP INT Mode CONFIRMED
*#0000# + Send : Set Default Language CONFIRMED
*#0007# + Send : Set Language to Russian CONFIRMED
*#0033# + Send : Set Language to French CONFIRMED
*#0034# + Send : Set Language to Spanish CONFIRMED
*#0039# + Send : Set Language to Italian CONFIRMED
*#0044# + Send : Set Language to English CONFIRMED
*#001# + Send : Set Language to English CONFIRMED (for new firmware)
*#0049# + Send : Set Language to German CONFIRMED
*#0066# + Send : Set Language to Thai CONFIRMED
*#0084# + Send : Set Language to Vietnamese CONFIRMED
*#0966# + Send : Set Language to Arabic CONFIRMED

SOME CHINESE MODELS:
*#110*01# -> Device -> Set UART -> PS Config -> UART1/115200 :Enable COM port
1122, 3344, 1234, 5678 : default user code
*#110*01# : Engineer mode
*#987*99# : Restore factory settings
*#369# : LCD contrast
*#800# : software version
*#900# : software version
*#987# : Factory mode

*#19992006# : phone reset(copy D820 SAMSUNG)
*#9426*357# : copy NOKIA 6280

Service codes Fly:
2040(i) reset defaults: *#987*99# Send
MX200 reset defaults: *#987*99# Send
MX200 software version: *#900# Send
SL300m reset defaults: *#987*99# Send
SL300m software version: *#900# Send
SL500m reset defaults: *#987*99# Send
SL500m software version: *#900# Send
MP500 reset defaults: *#987*99# Send
MP500 software version: *#900# Send
Set language to English: *#0044#
Set language to Russian: *#0007#

Service codes Konka:
C926 software version: *320# Send
C926 set default language: *#0000# Send
C926 set English language: *#0044# Send

Service codes GStar:
GM208 (Chinese Nokea 6230+) engineering menu: *#66*#
Set language to English: *#0044#
Set language to Russian: *#0007#