I have personally upgraded many forums from 3.11 to 4.0.4 and then 4.1.0 with zero issues. I hope you have a backup of your garage database so you can recover, starting from scratch is an extreme measure.
To get to the bottom of your issue I need to see the the error, PM me a site address to look. This is doable and should be rather painless really.
However, if you decide to start from scratch, I highly suggest 4.1.0.
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