you must check 'New security' option.
USB cable with 'New Security' option:
1. Phone must be powered on.
2. Type *#726872# to switch phone to Samsung USB mode.
3. Connect USB cable, install drivers.
4. Press 'Unlock' button for direct unlock or 'Read codes' to read security codes.
[ 31/12/2017 13:23:00 ] Reading phone info... OK
[ 31/12/2017 13:23:00 ] Model: GT-S5603
[ 31/12/2017 13:23:00 ] Country code: أپأں¾أ†
[ 31/12/2017 13:23:00 ] Cal date: 2009-09-28
[ 31/12/2017 13:23:00 ] Factory SW: S5603JVII1
[ 31/12/2017 13:23:00 ] Unique number: 80080000620961
[ 31/12/2017 13:23:00 ] Memory phone: K5R2G1GACC(S5600)S
[ 31/12/2017 13:23:00 ] Phone SN: RVNZ175394
[ 31/12/2017 13:23:00 ] Reading IMEI... OK
[ 31/12/2017 13:23:00 ] IMEI: 356XXXXXXXXX
[ 31/12/2017 13:23:00 ] Reading SYSINFO... error (access denied)
____________________________________________________
[ 31/12/2017 13:27:00 ] Searching Samsung modem... detected COM60
[ 31/12/2017 13:27:00 ] Reading phone info...
[ 31/12/2017 13:27:00 ] Model: GT-S5603
[ 31/12/2017 13:27:00 ] Country code: أپأں¾أ†
[ 31/12/2017 13:27:00 ] Cal date: 2009-09-28
[ 31/12/2017 13:27:00 ] Factory SW: S5603JVII1
[ 31/12/2017 13:27:00 ] Unique number: 80080000620961
[ 31/12/2017 13:27:00 ] Memory phone: K5R2G1GACC(S5600)S
[ 31/12/2017 13:27:00 ] Reading SYSINFO... OK
[ 31/12/2017 13:27:00 ] Searching server... OK
[ 31/12/2017 13:27:00 ] Writing sysinfo... OK
[ 31/12/2017 13:27:00 ] Reseting... OK
[ 31/12/2017 13:27:00 ] Unlock done
Done with Samsung Tool PRO v.29.9 v.29.9
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