Manually upgrade AVEN failed
In a offline environment, I'd like to upgrade AVEN for my 7.0 FGT VM(licensed) manaully, but when I upload the AVEN file, I get the error message: "Failed to upgrade database".
The detail message show in the CLI debug is as follow:
```
doInstallUpdatePackage[856]-Pkg has wrong firmware version-04000000
upd_install_pkg_file[1210]-Installation of pkg /tmp/monitor_upload_hunXz2 has failed
upd_manual_virdb[59]-Failed installing pkg file
```
The AVEN file is export from fortimanager and it should be legal, after I check the export AVEN file I found:
```
pkg header firmware version: 04000000
FMGI obj header firmware version: 01000000
OBLT obj header firmware version: 04000000
AVEN obj header firmware version: 07000000
```
It seems the error is caused by the pkg header firmware version.
Any idea?
Thanks.
