xptiger: you need to enter "mntroot rw" command before editing, which will mount disk with read/write access, default it is only reading access.
thanhlp: glad you have the internet now
I was not able to register my kindle too. I guess they are checking the IP address and denies access from unknown sources. However I was able to trick kindle to think i'm registered by these instructions: https://www.mobileread.com/forums/sho...hlight=reginfo
(just create "reginfo" file with your data in /var/local/java/prefs/)