OK thanks. Yes, we're happy just to have the ETH and BCH. Would have been nice to get the SV too, it's at least $1000 worth but I get that it's impossible without the keys. Thanks for the help!
Before giving up on the BSV, you may want to try to update the firmware. There's still the chance that the device
will not reset itself and function with the old seed still activated. Now that you've extracted the ETH and the BCH the risk has been mitigated drastically, and you're only out the BSV if it fails. Just a thought.