You can jump between FW's on a DEX without a modchip. There for the special downgrader pup's are made for. Also you can do debug cfw's but you wont be able to simply install a retail fw. This would brick the console on the same way like if you try to install a debug fw on a retail one. But with service mode and changing the idps again you would be able to go back to a normal retail fw.
Yes they are dev's. I'm not scared to call the names, i simply don't have permission to do so. That has a good reason but i maybe will explain it when we release something. If i would call the things they have done i would already say to much but it mainly have nothing to do with games at the end.
The way to get hand's on the elf's is so old that no body does think about it after the whole JIG and key stuff we have seen. And the dev's which have entered the scene to JIG times doesn't know about it cause the only coded apps but never gave a deeper look on the possibilities available.