SGH-T989 (UVLDH firmware) Goes into Recovery mode, but not Download

Question

I'm trying to get my SGH-T989 into Download mode so I can flash TWRP with heimdal. It's been awhile since I've done this and from what I recall (and have researched a bit) I need to:




  • unplug cable

  • power off

  • hold Vol_Down + Vol_UP

  • plug in cable



This isn't working though. All I get is recovery mode and what I want is Download mode.



Not sure if the device/cable/PC is bad. Using Linux. Tried a 14.04 box and a 16.04. What have I missed?. Been googling, but lots of mixed info. Anyone help?
Thanks



----- update ----------
update with pic of dongle I purchased:


— Eris Wagner | Sources

Answer

Older Samsung devices might require a special USB dongle/jig like this one to trigger Odin mode - just plug it in when the device is powered off. It's essentially a resistor between USB pins so you can also make one yourself if you're up for it.


— Andy Yan | Sources

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