One of the best things about the original Kindle Fire was the ability to root it and easily install custom ROMs. However, that does not appear to be the case with the new Kindle Fire HD, at least not yet. According to XDA member kinfauns, the Kindle Fire HD’s bootloader is signed and made for high security devices. This means that it could take quite a while before we see any custom ROMs or kernels for the device .
Don’t get too discouraged, though. Remember that the Nook Tablet was locked down at first, but the guys on XDA were able to unlock it and it went on to become one of the developer favorites.