DSi V1.43 Patch for R4i Gold 3DS (21st July): uninstall ?

Hi, I recently bought a NDSi and updated it immediately to version 1.4.3e (stupid of me, I know ...).
Afterwards I bought a R4i Gold 3DS cart, that was supposed to work with 1.4.3.
I copied Wood 1.33 and immediately ran the specific patch that was released on July 21st.
I got a success message for the patch (succeds) but unfortunately this was not the case.
When I select the Chessmaster icon, I get an error message and need to power off.
The cart itself works fine. A friend of mine tried it on his NDSi with an older version, and it worked like a charm.I have a feeling that the patch is responsible for the malfunction. Is there a way to undo the patch ?
Can anyone help me to make the flashcart work ?Thanks for your help.

Thanks for your support, abalondon, but how can I update my flashcart with new patches ?
From the moment that I press the Chessmaster icon, I get an error message and need to power off my NDSi.Is there a way to update the micro-sdhc in Windows 7 ?

OK. Thanks for the advice, abalondon. I'll give it a try.