modified A50 cable to bring ground to
Testpoint
Click here for A50 testpoint solutions
A55 and A52 Cut New and Old phones Testpoint
New
Old
You need to remove resister
For Older SL55 <= V15
For newer SL55 V16 + models just short the resister to ground
Click here enlarge Sl55 V16 + second method
You need to remove resister to unlock
Click Here for CF62 Testpoint Cutting Method