From what I have readed here and there, I suspect this is what it looks like if the brick happen if the emmc is already teared before the upgrade, meaning no other upgrade is possible, it will be in some sort of read only mode from what I have seen in posts, this then also happens on normal firmware right?
it is a different brick than the ones who did managed to upgrade and it failed which results in a cold brick, this is the brick what this firmware and u-boot is supposed to fix, very sad unfortunately.