I have a zd1211 based wifi card. The Debian installer did not detect it when I booted with the usb powered hub plugged into the otg port (which the card is plugged into). Instead I had to boot then plug the hub in after booted.
Next the installer cannot find the firmware driver. Select "Go Back" and "Execute shell" then mount a media with the firmware and copy it to /lib/firmware/`uname -r` Then exit the shell, and run the detect hardware step again.. now the wifi works and you can complete the install.