I do not remember for certain, but I believe that in addition to what Altairseven said, you can decrypt the NAND and extract what you need as long as you have a dump of the movable.sed from before it bricked. I am pretty sure that some homebrew apps that are capable of making decrypted NAND backups let you choose a NAND dump and a movable.sed from an SD card to use for the process.