The firmware file needs to be downloaded or extracted from the windows
driver file and configured in nixpkgs.config e.g.:
sane.snapscanFirmware = /firmware/esfw41.bin;
For some reason, SANE suddenly stopped recognizing my scanner recently:
| $ scanimage -L
|
| No scanners were identified. If you were expecting something different,
| check that the scanner is plugged in, turned on and detected by the
| sane-find-scanner tool (if appropriate). Please read the documentation
| which came with this software (README, FAQ, manpages).
I was able to remedy this issue by building SANE with the latest version
of the backends package from Git, by adding the following override to
~/.nixpkgs/config.nix:
| {
| packageOverrides = pkgs:
| {
| saneBackends = pkgs.saneBackendsGit;
| };
| }
