ReadyNAS 204 hangs after FW Upgrade, display: "99% Encryption Key", No admin page

Hello,

although its a very worthy (best for its price) NAS, I've got sometimes massive problems with Firmware Updates. This time it is the FW Upgrade 6.50 -> 6.60. The NAS hangs now at display 99% Encryption (Using built-in encryption Crypto-LUKS environment). The SSH and SMBD is working, also NFS, but no Admin page. So far I tracked down to: apache2 and librddclient.so:

root@readynas:~# readynas-agent
Connect rddclient failed
Error processing nml DiskEnclosure request
Connect rddclient failed
Error processing nml volume request
Warning: Failed to connect to the agentx master agent ([NIL]):
readynas-agent is up and running.

root@readynas:~# journalctl -afb
Oct 20 16:21:09 readynas apache2[30957]: [error] [client 192.168.1xx.1yy] Connect rddclient failed, referer: http://192.168.1nn.1mm/admin/

root@readynas:~# find / -iname "librddclient"
"usr":
/usr/lib/librddclient.so.0
"var":
/var/lib/dpkg/info/librddclient.symbols
/var/lib/dpkg/info/librddclient.shlibs
/var/lib/dpkg/info/librddclient.list
/var/lib/dpkg/info/librddclient.postrm

root@readynas:~# grep -ri "librddclient"

"bin":

"boot":

"etc":

Binary file /etc/ld.so.cache matches

"home":

"lib":

"logs":

"lost+found":

"media":

"mnt":

"opt":

Binary file /opt/replication/bin/nmlctl matches
Binary file /opt/replication/bin/fsgrab matches
Binary file /opt/replication/usr/lib/libnmlctl.so matches
Binary file /opt/readycloud/bin/nmlcmd.hr.0.0.1 matches
Binary file /opt/readycloud/bin/fscmd.hr.0.0.1 matches
Binary file /opt/readycloud/bin/rcbrokerd matches
Binary file /opt/readycloud/bin/syscmd.hr.0.0.1 matches

"root":

/root/find_file_result.20161020154750.txt:/usr/lib/librddclient.so.0
/root/find_file_result.20161020154750.txt:/var/lib/dpkg/info/librddclient.symbols
/root/find_file_result.20161020154750.txt:/var/lib/dpkg/info/librddclient.shlibs
/root/find_file_result.20161020154750.txt:/var/lib/dpkg/info/librddclient.list
/root/find_file_result.20161020154750.txt:/var/lib/dpkg/info/librddclient.postrm
Binary file /root/find_file_result.20161019212821.txt matches

"run":

"sbin":

"srv":

"temp":

"tmp":

"usr":

Binary file /usr/sbin/readynas-agent matches
Binary file /usr/sbin/readynasd matches
Binary file /usr/sbin/bt-broker matches
Binary file /usr/sbin/rnotifyd matches
Binary file /usr/sbin/readydropd matches
Binary file /usr/bin/rn_nml matches
Binary file /usr/lib/librddclient.so.0 matches
"var":

Binary file /var/log/journal/e460d66694404b72b8d5c13ff202d589/system.journal matches
Binary file /var/cache/apt/pkgcache.bin matches
Binary file /var/cache/apt/srcpkgcache.bin matches
Binary file /var/cache/ldconfig/aux-cache matches
Binary file /var/cores/core-readynasd matches
/var/lib/apt/extended_states:Package: librddclient
/var/lib/apt/lists/apt.readynas.com_packages_readynasos_dists_6.6.0_main_binary-armel_Packages:Depends: libc6 (>= 2.4), libnml (>= 196), librddclient (>= 5455), libsnmp30 (>= 5.7.2.1+dfsg-1~dfsg), libxml2 (>= 2.7.4)
/var/lib/apt/lists/apt.readynas.com_packages_readynasos_dists_6.6.0_main_binary-armel_Packages:Depends: lsb-base, libattr1 (>= 1:2.4.46-8), libc6 (>= 2.7), libjson7, librddclient (>= 5455), libsqlite3-0 (>= 3.5.9), libssl1.0.0 (>= 1.0.0), libsystemd-journal0 (>= 44-24), libxml2 (>= 2.7.4), zlib1g (>= 1:1.1.4)
/var/lib/dpkg/available:Package: librddclient
/var/lib/dpkg/available:Depends: lsb-base, lsyncd (>= 2), libc6 (>= 2.4), libjson7, librddclient (>= 5455), libsqlite3-0 (>= 3.5.9), libssl1.0.0 (>= 1.0.0), zlib1g (>= 1:1.1.4)
/var/lib/dpkg/available:Depends: lsb-base, libacl1 (>= 2.2.51-8), libattr1 (>= 1:2.4.46-8), libc6 (>= 2.9), libjson7, librddclient (>= 6.6.0), libsqlite3-0 (>= 3.5.9), libssl1.0.0 (>= 1.0.0), libsystemd0, libxml2 (>= 2.7.4)
/var/lib/dpkg/status-orig:Package: librddclient
/var/lib/dpkg/status-orig:Depends: lsb-base, libacl1 (>= 2.2.51-8), libattr1 (>= 1:2.4.46-8), libc6 (>= 2.9), libjson7, librddclient (>= 6.6.0), libsqlite3-0 (>= 3.5.9), libssl1.0.0 (>= 1.0.0), libsystemd0, libxml2 (>= 2.7.4)
/var/lib/dpkg/status-orig:Depends: libc6 (>= 2.4), libnml (>= 196), librddclient (>= 5455), libsnmp30 (>= 5.7.2.1+dfsg-1~dfsg), libxml2 (>= 2.7.4)
/var/lib/dpkg/status:Package: librddclient
/var/lib/dpkg/status:Depends: lsb-base, libacl1 (>= 2.2.51-8), libattr1 (>= 1:2.4.46-8), libc6 (>= 2.9), libjson7, librddclient (>= 6.6.0), libsqlite3-0 (>= 3.5.9), libssl1.0.0 (>= 1.0.0), libsystemd0, libxml2 (>= 2.7.4)
/var/lib/dpkg/status:Depends: libc6 (>= 2.4), libnml (>= 196), librddclient (>= 5455), libsnmp30 (>= 5.7.2.1+dfsg-1~dfsg), libxml2 (>= 2.7.4)
/var/lib/dpkg/available-old:Package: librddclient
/var/lib/dpkg/available-old:Depends: lsb-base, lsyncd (>= 2), libc6 (>= 2.4), libjson7, librddclient (>= 5455), libsqlite3-0 (>= 3.5.9), libssl1.0.0 (>= 1.0.0), zlib1g (>= 1:1.1.4)
/var/lib/dpkg/available-old:Depends: lsb-base, libattr1 (>= 1:2.4.46-8), libc6 (>= 2.13), libjson7, librddclient, libsqlite3-0, libssl1.0.0 (>= 1.0.0), libsystemd-journal0, libxml2 (>= 2.7.4)
/var/lib/dpkg/status-old:Package: librddclient
/var/lib/dpkg/status-old:Depends: lsb-base, libacl1 (>= 2.2.51-8), libattr1 (>= 1:2.4.46-8), libc6 (>= 2.9), libjson7, librddclient (>= 6.6.0), libsqlite3-0 (>= 3.5.9), libssl1.0.0 (>= 1.0.0), libsystemd0, libxml2 (>= 2.7.4)
/var/lib/dpkg/status-old:Depends: libc6 (>= 2.4), libnml (>= 196), librddclient (>= 5455), libsnmp30 (>= 5.7.2.1+dfsg-1~dfsg), libxml2 (>= 2.7.4)
/var/lib/dpkg/info/librddclient.symbols:librddclient.so.0 librddclient #MINVER#
/var/lib/dpkg/info/librddclient.symbols: connect_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.symbols: disconnect_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.symbols: process_conn_request_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.symbols: process_event_request_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.symbols: process_nml_conn_request_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.symbols: process_nml_event_request_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.symbols: process_nml_request_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.symbols: process_request_rddclient@Base 5455
/var/lib/dpkg/info/librddclient.shlibs:librddclient 0 librddclient
/var/lib/dpkg/info/librddclient.list:/usr/lib/librddclient.so.0
/var/lib/dpkg/info/librddclient.list:/usr/share/doc/librddclient
/var/lib/dpkg/info/librddclient.list:/usr/share/doc/librddclient/changelog.gz

Currently backing up the disks and keys, but I don't want to hard reset the NAS. What can I do now?

Thanks in advance