Avira up2date error: Is there any solution?

I was able to solve the failed virus pattern updates on my XG firewall. The problem seems to be that the firewall gets wrong file size and hash informations for Avira AV pattern v1.0.12965 and Sophos AV pattern v1.0.8492. After I filled in the correct values the firewall software installed these pattern files and downloaded and installed another set of pattern files (the latest ones) from the download server. Now my firewall is using v1.0.13096 of Avira AV pattern and v1.0.8522 of Sophos AV pattern.

Disclaimer:
I shall not be held liable for any damages or problems incurred as a consequence of executing one or all of the following steps. The use of this information is at your own risk.

The information for the pattern files is stored in the file pattern under /content/u2d. I don't know if the AV engines of the firewall need to be updated sequentially. As there are more recent pattern files than the ones that got stucked it might be sufficient to get the latest one.

1. So you could rename the file pattern in /content/u2d (mv /content/u2d/pattern /content/ud2/pattern.org) and try to update the pattern files with the GUI using System > Administration > Updates.
Give the firewall about 10 minutes for the update process. The pattern files are each more than 130MB in size.
If the update was successfull you will see an update message in System > Diagnostics > Log Viewer 'View Log for System'.
You can stop here.

2. What I did to get the stucked update for pattern files v1.0.12965 and v1.0.8492 running was to change the values in /content/u2d/pattern. Before doing this please make a copy of the pattern file.
Before editing my pattern file looked like this:

#avira_1.00_1.0.12965_full.tar.gz.gpg#https://d30ncyzaneb4q0.cloudfront.net/avira_1.00_1.0.12965_full.tar.gz.gpg#1.0.12965#142763349#61319209ae709790bb4c2af30c61308a#avira#1.00#full
#savi_1.00_1.0.8492_full.tar.gz.gpg#https://d30ncyzaneb4q0.cloudfront.net/savi_1.00_1.0.8492_full.tar.gz.gpg#1.0.8492#136774155#f48e5b801bb8067eb8ae81435056027c#savi#1.00#full

So the values 142763349 and 136774155 seem to be the file sizes, 61319209ae709790bb4c2af30c61308a and f48e5b801bb8067eb8ae81435056027c look like md5 hashes.
I checked these values with the files I manually downloaded from the url addresses and they were different. So this is what my pattern file looked like after editing:

#avira_1.00_1.0.12965_full.tar.gz.gpg#https://d30ncyzaneb4q0.cloudfront.net/avira_1.00_1.0.12965_full.tar.gz.gpg#1.0.12965#142763133#ecaa79ee3e7eb7a72422afa5047b4ed3#avira#1.00#full
#savi_1.00_1.0.8492_full.tar.gz.gpg#https://d30ncyzaneb4q0.cloudfront.net/savi_1.00_1.0.8492_full.tar.gz.gpg#1.0.8492#136774428#c914b03ba829d85e45d38dde70c9dc5c#savi#1.00#full

After saving my changes I started a pattern update via GUI using System > Administration > Updates.

My firewall installed pattern Avira AV pattern v1.0.12965 and Sophos AV pattern v1.0.8492 first, after that it downloaded and installed v1.0.13096 of Avira AV pattern and v1.0.8522 of Sophos AV pattern.

Hope this helps.
Best Regards.