I bought a Visioneer OneTouch 7400 second hand at a price that was almost like finding it in the trash. Because the 7300 is supported I thought it would be fairly easy to get the 7400 working. Getting it working was easy, it was finding the firmware that was a real bear. I have it working for root at this point, and thought I would document the steps I took so other people can also get this working. In addition, this yields the cis3R5B1.fw firmware file, so it should help people with other scanners that use that firmware for the gt6816 chip.
Go to Visioneer and download the 32 bit drivers for windows. http://www.deviceden.com/download/1469/visioneer/onetouch-7400-usb/driver/ This is in msi format, and the file was called 7400.32.408602.EN.msi when I downloaded it. If you have windows, you can just install it and pull out the firmware file using the sane directions. If you run only linux, you will need to be a bit more creative. Make sure that you have p7zip installed. Create a directory to unpack the msi in, I used msi7z, and cp it into the directory. Cd to the directory and run 7z x 7400.32.408602.EN.msi This will extract a bunch of files, not one of them which is obviously the firmware. However, there is a file called _StringData. Open it in an editor that has search (I used vim) and find the string cis3R5B1. Look for the first C__ before that in the file. Remember the first 6 or so characters after that C__, in my case it was 302197. Now, run the command cabextract 7400.32.408602.EN.msi This will spew a whole lot more files. After the command is done run the command ls | grep 302197 This will list the file that contains the firmware. In my case that file was called _302197197C1841CFAEEE6346AB0E4996 So I just copied the file to /usr/share/sane/gt68xx/cis3R5B1.fw and changed the permissions to +r for everyone. At this point the firmware is in place, but the gt68xx.conf file in /etc/sane.d/ has to be modified. I edited it and commented everything in the file except the following lines: usb 0x04a7 0x04a0 #vendor "Visioneer" #model "OneTouch 7400" override "visioneer-onetouch-7300" firmware "/usr/share/sane/gt68xx/cis3R5B1.fw" # # Autodetect Visioneer OneTouch 7300 usb 0x04a7 0x0444 That is all there was to it and I was able to run the scanimage > test_image.pnm command and it worked fine. I am still working on setting user permission to run this scanner automatically. And I haven't tested beyond this, so there could be other gotchas hiding in the details.
