Samsung g935v error loader by test point

Welcome to Octoplus FRP Tool v.1.5.5.0
Platform: SAMSUNG
Selected model: SM-G935V
Put the phone into EDL mode:
1. Attach testpoint as shown in Help manual;
2. Connect USB cable;
3. Release testpoint after 3-5 seconds.
Searching for a phone. Please wait...
Connecting...
Reading info...
QC HW ID: 009470E100200000
QC CPU: Snapdragon 820 MSM8996
Searching loader...
Sending loaders...
Could not write loader!
Backup saved as SAMSUNG_SM-G935V_22-12-2018_12-27-46.dump file
Performed by 1.5.5.0 Software version.
PLS HELP ME