This is procedure(copy paste from other place)
Tools & Materials :
-Setool Box with V1.01 or Latest software installed
-Setool Cable set
-K800i Gdfs file ( included on Setool folder )
-K800i Erom file ( included on Setool folder )
-Internet Connection
Step By Step :
-Open Setool Software
-Pick ” Empty Fill Repair ” Tab
-Pick K800i Model
-Pick ” Setting ” Tab
-Check ” Signed Mode “
-Back to ” Empty Fill Repair ” Tab
-Click ” Recovery “, wait until process done
-Add K800i Gdfs file
-Add K800i Erom file ( pick CID 53 )
-Connect phone to cable
-Click ” Flash “
-Wait until all process done
-For last step, do Identify and confirm that gdfs is legiled.
-All Done