Hi, I bought 4 bluetooth dongles and all off them have the same mac address.hciconfig -a show hci0: Type: USB BD Address: 00:15:83:15:A3:10 ACL MTU: 672:4 SCO MTU: 48:1 UP RUNNING PSCAN RX bytes:5637 acl:26 sco:0 events:221 errors:0 TX bytes:2362 acl:25 sco:0 commands:179 errors:0 Features: 0xff 0x3e 0x85 0x38 0x18 0x18 0x00 0x00 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 Link policy: RSWITCH HOLD SNIFF PARK Link mode: SLAVE ACCEPT Name: '' Class: 0x000104 Service Classes: Unspecified Device Class: Computer, Desktop workstation HCI Ver: 2.0 (0x3) HCI Rev: 0xc5c LMP Ver: 2.0 (0x3) LMP Subver: 0xc5c Manufacturer: Cambridge Silicon Radio (10) I tried ./bdaddr -i hci0 00:09:DA:50:29:30 , ./bdaddr -i hci0 -r 00:09:DA:50:29:30 ,bccmd -d 0 psset -s 0 bdaddr 0×44 0×00 0×66 0×55 0×33 0×00 0×22 0×11 None of them seems to work. i have kernel 2.6.31 and bluez 4.60. i only need to change The mac address to avoid chaos when i proceed with my application Thanks Ahmed -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html