Your best and safest bet, in my opinion, others may differ.
Remove the Hard Drive from your T5. It's really easy to do and a ten minute job.
Then using your pc, you can simply transfer whatever you want with normal Windows file transfer.
The advantage to this is.
1. So much easier to see what you are doing.
2. Less risk of corrupted or even non working files.
Eliminates entirely the risk of electrical shorts or similar.
Having 'fried' my first Tyros, past economical repair, I would never, ever, ever connect a Tyros directly to a pc again.
It's your keyboard, and it's your choice.
But once you've done it and got a safe backup on your pc, you'll know exactly where you are.
You'll need a cable or dock to read the drive from the pc. So check what sort of hard drive is in the Tyros and order one before you start.
They are only bog standard laptop 2.5"size drives, but the connection will either be for IDE or SATA.
NEVER EVER connect a drive to a pc or keyboard whilst the power is on.
Keith.
Keith.