It is important that we know the model, since manufacturer's marketing names change and vary depending on the part of the world you bought the device from.
Please use this table and the first 4 (or 6) characters of your serial number to identify your model:
https://wiki.mobileread.com/wiki/Kindle_Serial_Numbers
You can't change your post's title, but you can use the 'report post' button on it and ask a moderator to set the proper prefix.
Note:
The PW-1 (if that is what it turns out to be from the chart) uses the K5 prefix (it made sense at the time it was decided).
It will also help if you tell us what reporting resources the device has, the main one being if it is jail broken.
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This is a technical forum and your posting about a technical problem, so we really, really need the above technical information with your report.
I.E: Proper context.