1. You are probably very wrong about the cause of the issue. If it was caused by a faulty power supply, the drive would most likely not work at all.

2. With the reallocated sector count (from your post on hddguru), there is a physical failure inside the drive. It is not firmware, or at least not just a firmware issue.

3. HDDSuperClone cannot work with the firmware on your drive. Even if there is a firmware issue, only a professional with the proper (and expensive) tools could work with it.

With all that said, how important is the data? If it is worth paying for professional recovery, the you should seek professional recovery while there is still a good chance at recovery. The more you mess with it, the less likely for a successful recovery.

If the data is not important enough for professional recovery, then HDDSuperClone would be your best chance for cloning the drive. If that is your choice, I would suggest using the analyze feature of HDDSuperClone to see what it says the problem may be, at least so you have an idea. I suspect a weak/failing head. And to be clear, the drive could die at any time, as that is the nature of failing drives. HDDSuperClone does the best job possible of skipping out of a bad head to get the most good data first. But it can't magically fix your issue, it can only try to get the most good data first before digging into the bad head. If you go the DIY route, you will not likely get a speedy recovery. There are some conditions that can be helped by the paid pro version of HDDSuperClone, but without more direct information (such as a progress log file), I cannot say if the pro version would be helpful or not.