I just unlock my Samsung MEGA GT-I9200 Android 4.2.2. I want to share this to everyone.
Follow this instruction to root your phone first.
[ROOT] Galaxy Mega 6.3 - GT-I9205 and GT-I9200 - xda-developers
*#7284# set to PDA
*#9090# set to UART
Plug your device into the computer
Use latest Samsung tool v17.00
Reading phone info...
Model: GT-I9200
Android version: 4.2.2
Product code: GT-I9200ZWATTT
Phone version: I9200UBUAME5
PDA version: I9200UBUAME5
CSC version: I9200UUBAME5
IMEI: xxxxxxxxxxxxxxxxxxxx (I masked this
)
Phone S/N: RF1D639D3KZ
Checking Super user right... true
Backuping MMCBLK... OK
Writing data to phone... OK
Rebooting phone... OK
Waiting phone... OK
Bypass MSL... OK
Unlocking... OK
Reseting... OK
Unlock done
Done with Samsung Tool v.17.0