I knew it was called something like that. eyekey made like 5 tools for dumping and fixing the NAND. I used them to fix mine that were made with the fw.img which I'm assuming you made yours the same way. however, I also redumped the slc and slcmpt partitions with the new NAND dumping tool. unfortunately, I'm not sure about your problem. I wouldn't think the image type would matter. there are ways to convert it, but that might corrupt the image. try one of eyekey's tools. iirc, the one that allows u to extract content with the otp works with the img files.