D-Ultimate Unlocker offers much faster and cheaper full direct unlock and relock of all existing A2, DB3350, DB2020 & DB2012 and PDA DB2000/DB2001 Sony Ericsson mobile phones.
Unlocking Sony Ericsson A1 phone with D-Ultimate Unlocker (via serial cable)
Note: The procedure can be done via DCU-60 USB cable, too (see Unlocking Sony Ericsson A2 phone for details). The program asks you to reconnect the phone several times, so then just disconnect and connect the cable while holding its '2' and '5' buttons.
GDFS reconstruction of Sony Ericsson A1 phone with D-Ultimate Unlocker(via serial cable)
Note: The procedure can be done via DCU-60 USB cable, too (see Unlocking Sony Ericsson A2 phone phone for details). The program asks you to reconnect the phone several times, so then just disconnect and connect the cable while holding its '2' and '5' buttons.