This has not been made "fancier" for easier use yet. It is unknown how
useful updating the firmware is.
Usage:
```
$ NIXPKGS_ALLOW_UNFREE=1 nix-build --argstr device pine64-pinephone -A pkgs.pine64-pinephone.qfirehose
$ sudo ./result/bin/QFirehose -l ./ -f ./newfw
```
But maybe read more about whether you want to update or not beforehand?
https://forum.pine64.org/showthread.php?tid=11815