I don't understand that last part...the 350 error is seperate. The Admin CP submission doesn't fix that.
To see what version of PHP you're running, create a file with this inside, and run it:
PHP Code:
<?php
phpinfo();
?>
As for the images: you probably forget to create the dir and chmod it properly. Again, it's in the
instructions.txt file. If you've chmoded it 777 and it STILL doesn't work, then it's likely a server issue.