Hello A6_quattro,
Make sure you updated ini files from web in VT iwt ecu disconnected before upgrading firmware (even in VT 2015-03-16 or after), than re-download 1.2.32 firmware manually from
http://svn.x-dsl.hu/f/ (make sure you are not using some cached version from browser cache by clearing it) and copy it in your VT_install_dir/webcache/fw, after that start VT (still with ecu disconnected) enter VT->Tools->Firmware->Firmware web tool, select v3_firmware_1.2.32.zip in the local directory and press the (Re)Install Firmware button to overwrite any previous copy of 1.2.32 which might be in dir.
After this you can safely upgrade firmware, but make sure to upload configuration after firmware upload (should happen automatic). The Safe mode you mentioned confirms something went wrong there.
If you are having any trouble after following the steps to the letter, please report and i'll look into it.
Best regards, Dave