To ssh in, I'd have to use another computer running Linux on the same network yea?
If you can then try these steps https://community.getumbrel.com/t/how-to-restore-your-node-wallet-updated/3602
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Using a new instance of umbrel node...
Does that mean deleting and reinstalling umbrel completely?
No. Donβt delete anything. Just spin up a new node on a new machine, recover it there and copy over your bitcoin data.