Update README.md
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@ -172,11 +172,22 @@ on the device.
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###### "Ignoring extra upload request."
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Extraneous upload requests are usually sent by the device if the image validation
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failed. If you downloaded a firmware that's contained in an archive (a `.zip` for
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failed. Some possible causes are:
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* If you downloaded a firmware that's contained in an archive (a `.zip` for
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example), you must extract this file, and then use the contained firmware file
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as the argument to the `-f` parameter. Some examples for file extensions used
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for firmware: `.chk`, `.bin`, `.trx`, `.img`.
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* Some devices prevent you from downgrading the firmware. See if it works with
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the latest version available for your device. If you're already using the latest
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version, it might be possible to patch the version info of the firmware file. A
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future version of `nmrpflash` might incorporate an auto-patch feature for these
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cases.
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* Your device might expect a different image format for `nmrpflash` than when
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flashing via the web interface.
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### Building and installing
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###### Linux, Mac OS X, BSDs
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