I made midlet (jar+jad file) which was running well in emulator so I wanted to test it running on my 3510i. I made simple wml page with links for downloading
<card id="card" title="Downloads">
[i tested other modifications e.g.]
what i got was only "response unknown" when I was opening the MyMIDlet link, the same result also by testing third party midlets this way...
but when I tested directly downloads to my mobile from other pages[e.g. wap.spruce.jp] the same midlet was downloaded with no problems...