root password doesn't work

I have a jailbroken Kindle Paperwhite. usbnetwork is working and I had shell access working via ssh over usb. I'm not sure what changed, but after I installed KUAL, skipstone, backdoor lock, the root password doesn't work.

I can't get access to the kindle now. The root password was 'mario', but it doesn't work now. I've tried the framework user with mario password, that doesn't work either.