Samsung A300H unlock done version 4.4.4
UNLOCK INSTRUCTIONS:
Micro-USB cable:
1. Phone must be powered on.
2. Type *#0808# and select 'DM+MODEM+ADB'.
3. Type *#9090# and choose 'DM/DUN over HSIC' (ignore it, if it's not available).
4. Reboot phone.
Or use 'Activate Diag' function from 'Repair' tab.
5. Connect USB cable, install drivers if needed.
6. Select Samsung diagnostic port in port settings.
7. Press 'Unlock' button for direct unlock.
Done with Samsung Tool PRO v.23.9
UNLOCK INSTRUCTIONS:
Micro-USB cable:
1. Phone must be powered on.
2. Type *#0808# and select 'DM+MODEM+ADB'.
3. Type *#9090# and choose 'DM/DUN over HSIC' (ignore it, if it's not available).
4. Reboot phone.
Or use 'Activate Diag' function from 'Repair' tab.
5. Connect USB cable, install drivers if needed.
6. Select Samsung diagnostic port in port settings.
7. Press 'Unlock' button for direct unlock.
Done with Samsung Tool PRO v.23.9