Make sure you select 'bypass DB2020 security' in setool2lt
Also try recreating the vdk file from the main firmware in SIMOX's SIMLockPatchGen.exe I used K800_R8BF003_MAIN_GENERIC_WI_RED52.mbn found here>
K800_R8BF003_MAIN_GENERIC_WI_RED52.mbn
The software I used is all here>
http://www.mobile-unlock-codes.co.uk/software.rar