ReadyNas104 - cannot active SMB

I' ve upgrade the firmware from 6.7.5 to 6.8.0 the other day. After that I installed one app from the website but failed.

And the app cannot be started or uninstalled from the website, so I used command dpkg -r to uninstall that through SSH.

Then I reboot the nas and found I cannot connect the nas by Network Neighborhood, even use IP address directly.

I checked the website that smb button turned grey. Whenever activate it times, SMB still cannot work and the button was grey all the time.

So I reinstall os 6.7.5 with img downloaded from office site, but the smb still not work.

Then upgade to os 6.8.0 again, the smb service still cannot be actived.

After the upgrade, the status is as follows and I'll mail the log.

root@z00-nas:~# systemctl status smb.service                                    ● smb.service - Samba SMB Daemon
   Loaded: loaded (/lib/systemd/system/smb.service; enabled; vendor preset: enab
led)
   Active: failed (Result: exit-code) since Thu 2017-09-14 02:30:22 H
KT; 36s ago
  Process: 6943 ExecStart=/usr/sbin/smbd $SMBDOPTIONS (code=exited, stat
us=1/FAILURE)
 Main PID: 6943 (code=exited, status=1/FAILURE)

Sep 14 02:30:20 z00-nas systemd[1]: Starting Samba SMB Daemon...
Sep 14 02:30:22 z00-nas systemd[1]: smb.service: Main process exited, co
de=exited, status=1/FAILURE
Sep 14 02:30:22 z00-nas systemd[1]: Failed to start Samba SMB Daemon.
Sep 14 02:30:22 z00-nas systemd[1]: smb.service: Unit entered failed sta
te.
Sep 14 02:30:22 z00-nas systemd[1]: smb.service: Failed with result 'exi
t-code'.
root@z00-nas:~#

I checked the questions asked in forums, but cannot found the fix methon except factory reset.

But I don't have enough spaces to backup from the NAS, is there any other way to fix it?