In qcom MSM89XX android5.0 bluedroid, you can use btnvtool or qcom tool QXDM to change bt address , but the address can't be change always , if you have the authority
,you can change the bluetooth address once ,by those tools,
About btnvtool ,which be provided by bluedroid ,you can use this way to change the address name:
#adb shell
$btnvtool -p // display bt address
$hci_qcomm_init -e // display bt address too
$btnvtool -b 11:22:33:44:55:66 // you can use this way change bt address to be 11:22:33:44:55:66
The other way is use QXCM, you can find 00447 line in nv is bt address, you can change it direct