DSM-G600, DNS-3xx and NSA-220 Hack Forum

I followed the wiki to install a chrooted Debian that worked fine. I was able to log in with ssh and root user with the default passsword (12345678). Yesterday it stopped working and wonder how I can reset the root user. My shadow file is empty and the passwd file looks like this:

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root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/bin/sh
man:x:6:12:man:/var/cache/man:/bin/sh
lp:x:7:7:lp:/var/spool/lpd:/bin/sh
mail:x:8:8:mail:/var/mail:/bin/sh
news:x:9:9:news:/var/spool/news:/bin/sh
uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh
proxy:x:13:13:proxy:/bin:/bin/sh
www-data:x:33:33:www-data:/var/www:/bin/sh
backup:x:34:34:backup:/var/backups:/bin/sh
list:x:38:38:Mailing List Manager:/var/list:/bin/sh
irc:x:39:39:ircd:/var/run/ircd:/bin/sh
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh
sshd:x:100:65534::/var/run/sshd:/usr/sbin/nologin
jedisthlm:x:1000:1000:Jens,,,:/home/jedisthlm:/bin/bash
messagebus:x:101:103::/var/run/dbus:/bin/false
avahi:x:102:104:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false
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