That's because you tried OS 4.5.2, which just locked your calculator.
Then I'm sorry, you cannot install an OS older than 4.5.2 anymore.
Which means you can't install Ndless anymore, you can't fix things through software, you can't complete nLoader setup...
Try to install OS 4.5.2 again
If it still does, then the only way out I can think of will be to reflash the Boot2 partition through a cheap USB/TTL interface :
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