I cannot get a user manual for bower sfd35c - Bower SFD35C for Canon TTL Flash

More than likely - look it up on Google, or contact the mfr

the closest I could get for you

user manual for Bower Flash SFD926S

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Are you looking for service or op manual?

What is wrong with your flash?

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I have a canon 50D also and want to get a flash for it but can't afford canon flash. Any suggestions on a reliable off brand?

batteries are too low in power

This is probably not the camera settings. Pentax k200D wilt only give auto-flash with just three of their own units. Sounds like you have the Bower set on Auto. Set the flash to Manual, and adjust exposure on the aperture setting with the body set to manual as well.
Note that several people have reported problems with Bower units on digital cameras (and not just on Pentax)

err 99 is moisture or dew inside the camera.

This cheap flash work normally if ISO is set to 400.
But put it aside and I bought Nissin 622di and it works great in all modes

you can always try the site of the manufacturer or search for it on the web. it will usually come up as a PDF file so its handy if you have adobe installed.

Yes, just go to this URL scroll down about half way and download the manual.
http://www.bowerusa.com/catalog.php?item=300|330