accidentally updated to 1.4.5E, m3i zero no longer works

i took a chance and updated my DSi to 1.4.5E, because i needed to check the store for something. unfortunately the thing i wanted wasn't in the store, and not only that but now my m3i zero no longer works.

first question, is there a firmware for m3i zero that works on DSi 1.4.5E?

if not, what is my best option for a replacement cart? i don't really mind how much it costs, if the compatibility is high and the card is well supported i can pay a little more.

thanks.