Hi Guys

I've have an Antminer S4 running happily since early November without any real issues.

But yesterday, it didn't want to bootup. I think I've diagnose the problem as a faulty SD card. I've bought a new SD card but I don't have a backup (I had made one, but I've lost it)

How would I go about reloading the firmware on the SD card? I searched but can't seem to find a guide. Or where online can I find image of the SD card?

I stay in South Africa and have sluggish internet so to minimize down time I would prefer not to download an entire 4GB image clone.