For Some new BB5 models please read this link
N80 Cable Modification Modifcation for E61 Cable Modification For 6131,6125 and E60
For others new BB5 please check as below
Make sure the BSI to GND is 68K resistor normaly some cable comes with only 39K so you have to change to 68K
and from BSI to BSI box normaly it dosen't have you need to add either 5.1K or 7.5K , if you have put the 5.1K it not shown test mode ot local mode then use the 7.5k. Make sure the phone must be in test mode or local mode inorder to have working cable your your MT-Box
Below attachment is for others BB5 models Please Test and post result and logs for the phone info and flash log
regards