*2767*3855# -> Full EEPROM Reset ( THIS CODE REMOVES the Security Lock and formats The Mobile's Chipset ) But also changes IMEI to 447967-89-400044-0, To restore your old IMEI use the IMEI program found on the software page.
*2767*2878# -> Custom EEEPROM Reset ( does not change the securitu CODE )
These codes has been tested with version FLD_2C6 G60SB03X of Samsung SGH-600 : Jawahar