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root@debian:/home/fl# cd /home/fl/Downloads/
root@debian:/home/fl/Downloads# ls
brscan4-0.4.2-1.amd64.deb
root@debian:/home/fl/Downloads# dpkg -i --force-all brscan4-0.4.2-1.amd64.deb
Selecting previously unselected package brscan4.
(Reading database ... 144738 files and directories currently installed.)
Preparing to unpack brscan4-0.4.2-1.amd64.deb ...
Unpacking brscan4 (0.4.2-1) ...
Setting up brscan4 (0.4.2-1) ...
This software is based in part on the work of the Independent JPEG Group.
root@debian:/home/fl/Downloads# cd /opt/brother/scanner/brscan4/
root@debian:/opt/brother/scanner/brscan4# ls
Brsane4.ini brsaneconfig4 brsanenetdevice4.cfg doc models4 setupSaneScan4
root@debian:/opt/brother/scanner/brscan4# brsaneconfig4 -a name=scanner model=MFC-7860DW ip=192.168.000.107
root@debian:/opt/brother/scanner/brscan4# brsaneconfig4 -q | grep scanner
0 scanner "MFC-7860DW" I:192.168.000.107
root@debian:/opt/brother/scanner/brscan4# ls
Brsane4.ini brsaneconfig4 brsanenetdevice4.cfg doc models4 setupSaneScan4
Started simple-scan, error message:
no scanners detected.
A recent change to libsane in Debian may impact on the ability of third-party software to initiate scanning with a frontend. Some packages from some of the vendors above are likely to put files in the wrong place due to this change, leading to scanimage -L giving a negative report. The misplaced vendor backend files are often put somewhere like /usr/lib/sane or /usr/lib64/sane/. Copying them to /usr/lib/x86_64-linux-gnu/sane or /usr/lib/i386-linux-gnu/sane/ is one way of dealing with the issue.
In my case, copying the libraries and creating symlinks enabled sane to find my scanner.
Interesting, what Debian are you all running? I use a MFC-L2705DW over wifi on Stretch, and I've had no major issues at all. I use both scanner and printer at least weekly, sometimes daily.