Hi,
this phones used the following cable to transfer data:
- DCA-140 USB to USB (USB Port) Original Siemens
- DCA-100 USB to Serial (USB Port) Not Original
So, I propouse to use for flashing or unloching DCA-140 (or transform your DCA100 cable to DCA140). In this case, you need to download DCA-140 drivers. For schematic, see on attachemment.
Br,
dagos