Please help me with firmware for my R4

I have a flashcard that says R4-SDHC on the front, but my memory is only 2GB. I've read on this forum that if I have a 2GB card my flashcard is not an SDHC but simply an R4. And the website is R4Ultra.com So here's my problem. I've tried using SDHC, and R4 firmware but none of them will work. I dont know what I should try or what I firmware I should use. Can someone help me identify my card or give me the correct firmware. My flashcard used to work but because of my stupidity I ended up formatting my card before making a back-up of the original firmware. I really need your help

Replying to #1

That's not right. If you have a 4GB card or larger, you definitely do have an R4 SDHC. If you have something smaller (like 2GB), it could be an R4 SDHC or a normal R4. Your MicroSD card is not an SDHC, but your flashcart is still an R4 SDHC.
What exactly does the label on your card say?