I did it and doesn't work. When I use HackingToolkit after changing the file name, the folder "romfs" doesn't appear.
- Change the name "xxxxxxxx.romfs" to "romfs.bin"
- Put in the same folder that HackingToolkit
- Change the name "romfs.bin" to "decryptedromfs.bin"
- Open HackingToolkit, write "fs" and then "romfs"
- Nothing happens.