This means that you are entering a wrong root key.
How do you enter the root key? Do you type it? Just copy it from your backup and paste it in brainwalletx. It should be entered with the correct format.
You can try it. But it should generate the same addresses and the same ID as that tool.
Again, brainwalletx doesn't generate segwit addresses.
A question:
Have you backed up the wallet yourself or you have got the backup from someone?
I hope someone isn't trying to scam you.
Yes it's my wallet, no scam here. Segwit addresses almost certainly weren't used.
I'm typing it because that's the only option, it's on paper. But as per your suggestion I typed it out on two lines exactly as appears on the paper and cut and paste one line at a time. No matter what I do I'm not getting the same wallet ID/uid.