After a lot of struggling and bringing in another 2.5G adapter and a 2.5G switch, I was able to fix the issue.Something messed up badly my Windows TCPI/IP which needed a reset...So luckily there's no issue with FW 2.0.13
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I've just updated one device to 2.0.13 and the browser is sitting on 'Transferring file to the device... 0%' and the webview is corrupt... so there's maybe no issue with the FW but there's certainly an issue with the transfer system