Extract boot.img and recovery.img topic

Hi to everybody, I have at hands a NGM Polaris with MediaTek processors MT6575. I tried to do a dump of ROM with romdump_v82.zip but I can't obtain the files boot.img and recovery.img but I have those files:

• cheksum.md5


• config.gz


• system.info


• sistem.info.gz


• system.tar

So I do a full nand(?) bakcup with SP Flash Tool and I obtain the file ROM_0, so my answer there are a method to extract files missing from this file