Hm,works fine with my own repacker, created file is identical with just unpacking and repacking:
$ ../hik_repack -u digicap.dav dav
HIKvision firmware repacker V0.7, (c)oded by
[email protected] 11/2015
* 1210050031141110011
+ This seems to be a HK30 crypted file, unpacking HK30:
+ This...