First we extract our new modified firmware archive userfiles_file_downloads_LS-series-fw163_fwwin.zip and go into the ls_series-163 folder.
Then we open the LSUpdater.ini and add a [SpecialFlags] section, to add the Debug mode to the LSUpdater.exe.
....
[Flags]
VersionCheck = 0
NoFormatting = 1
[SpecialFlags]
Debug = 1
Then we run the LSUpdater.exe and go into the debug mode.
We deselect the Update BOOT filed and klick to OK to install the new firmware on our LS-WXL Duo.
After an coffee and cigarette break, we login into our LS-WXL Duo and can see the new Version.
At least we test the root ssh access.
tux@earth:~$ ssh root@LS-WXL1C3
root@LS-WXL1C3:~#