G900T 5.1.1 OG6 connection issues

I am trying to unlock/repair IMEI on a G900T with new security and can’t get it to do anything except read info. Any operations I try fail (unlock/reset msl/repair security).

Phone is rooted. Is this device/firmware supported? I didn’t try downgrading but usually that fails from 5.1.1. I’ve unlocked many of these on older firmware versions with no problems. Any help appreciated. 😀

Welcome to Octoplus/Octopus Box Samsung software version 2.1.4
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To connect SM-G900T phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
6. Go to dial window.
7. Enter "*#0808#" number.
8. Select "DM+Modem+ADB".
9. Press Home button.
10. Restart phone.
11. Press "Read Info" in software.
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Platform: Samsung Android
Selected port: COM4
Selected model: SM-G900T
Reading info, please wait…
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G900T
Firmware compiled date: Mon Jul 20 17:03:00 KST 2015
PDA version: G900TUVU1FOG6
CSC version: G900TTMB1FOG6
SW version: G900TUVU1FOG6
Phone IMEI: Unknown
Android version: 5.1.1 (LMY47X)
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Platform: Samsung Android
Selected port: COM4
Selected model: SM-G900T
Reading info…
Phone was not found on the selected port!
Phone unlocking failed
———————————————————————————–
Platform: Samsung Android
Selected port: COM4
Selected model: SM-G900T
Detected phone model: SM-G900T
Firmware compiled date: Mon Jul 20 17:03:00 KST 2015
PDA version: G900TUVU1FOG6
CSC version: G900TTMB1FOG6
SW version: G900TUVU1FOG6
Phone IMEI: Unknown
Android version: 5.1.1 (LMY47X)
Reading info…
Phone was not found on the selected port!
———————————————————————————–
Platform: Samsung Android
Selected port: COM4
Selected model: SM-G900T
Reading info…
Phone was not found on the selected port!
Operation was failed!