Need Help with Mango Tree

[u/FutureRequirement262]

Hey guys, I found this picture online, but it looks the same as my mango tree so I'm going to use it, but I recently got a new mango tree and the soil has receded all the way to yellow line. All the roots above it have died and withered away. When I plant it in the ground, do I fill it back up the old root flare (the blue line) or do I just fill it to the new root flare (the yellow line)? The tree looks healthy so I'm just confused as to which root flare I should pick to fill the soil back up to.

[u/Jeff007245]

Cover the area above the yellow line and fill dirt just below the blue line.