Hi, I'm new to bonsai trees.
I was attempting to repot a Hawaiian Umbrella tree suffering from (I think) root rot. While rinsing away the soil from the roots, all of the bark around the base of the truck (which was soft, peeling, and mushy underneath) washed off the tree as easily as the soil in the roots.
You can see what's left in the image. Is there any hope for this tree? Would repotting be a waste of time? Farther up the trunk, it's still green beneath the bark.