I can't put my Sony WT19a in flash mode. Can I use test point for this?

My Sony Live with Walkman WT19a got into a bootloop and I can not put it on flashmode. It just doesn't work when I connect the cable while I'm pressing VolDown.. But it shows the "charging" screen.

What do I can do in this situation? Can I use in a certain way the "Test Point" Mode so I can flash it with flashtool?

Thanks!

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