diff --git a/pkgs/development/mobile/flashtool/default.nix b/pkgs/development/mobile/flashtool/default.nix
new file mode 100644
index 00000000000..6f85ee648f6
--- /dev/null
+++ b/pkgs/development/mobile/flashtool/default.nix
@@ -0,0 +1,71 @@
+{ stdenv, requireFile, p7zip, jre, libusb1, androidsdk, gtk2, glib, libXtst }:
+
+# TODO:
+#
+#   The FlashTool and FlashToolConsole scripts are messy and should probably we
+#   replaced entirely. All these scripts do is try to guess the environment in
+#   which to run the Java binary (and they guess wrong on NixOS).
+#
+#   The release contains a freaky mixture of 32 and 64 bit binaries.
+#   Personally, I run these things (as 'root') in 32 bit Linux by way of:
+#
+#      setarch i686 ./FlashTool
+#
+#   It should be possible to run them in 64 bit mode, too.
+#
+#   The FlashTool scripts run 'chmod' on the binaries installed in the Nix
+#   store. These commands fail, naturally, because the Nix story is (hopefully)
+#   mounted read-only. This doesn't matter, though, because the build
+#   instructions fix the executable bits already.
+
+stdenv.mkDerivation rec {
+  name = "flashtool-0.9.14.0";
+
+  src = requireFile {
+    url = "http://dfiles.eu/files/n8c1c3pgc";
+    name = "flashtool-0.9.14.0-linux.tar.7z";
+    sha256 = "0mfjdjj7clz2dhkg7lzy1m8hk8ngla7zgcryf51aki1gnpbb2zc1";
+  };
+
+  buildInputs = [ p7zip jre ];
+
+  unpackPhase = ''
+    7z e ${src}
+    tar xf ${name}-linux.tar
+    sourceRoot=FlashTool
+  '';
+
+  buildPhase = ''
+    for n in x10flasher_lib/adb.linux.*; do
+      ln -sfv ${androidsdk}/bin/adb $n
+    done
+    for n in x10flasher_lib/fastboot.linux.*; do
+      ln -sfv ${androidsdk}/bin/fastboot $n
+    done
+    for n in "x10flasher_lib/linux/lib"*"/"*"/libus"*".so"* ; do
+      ln -sfv ${libusb1}/lib/libusb-1.0.so.0 $n
+    done
+    sed -i \
+      -e 's|ln -sf libusbx-1.0.so.0.1.0|ln -sf ${libusb1}/lib/libusb-1.0.so.0|' \
+      -e 's|export JAVA_HOME=.*|export JAVA_HOME=${jre}|' \
+      -e 's|export LD_LIBRARY_PATH=.*|export LD_LIBRARY_PATH=${libXtst}/lib:${glib}/lib:${gtk2}/lib:./x10flasher_lib/linux/lib32|' \
+      FlashTool FlashToolConsole
+    chmod +x x10flasher_lib/unyaffs.linux.x86
+    patchelf --set-interpreter "$(cat $NIX_GCC/nix-support/dynamic-linker)" x10flasher_lib/unyaffs.linux.x86
+    ln -sf unyaffs.linux.x86 x10flasher_lib/unyaffs.linux.x64
+  '';
+
+  installPhase = ''
+    mkdir -p $out
+    mv * $out/
+  '';
+
+  meta = {
+    homepage = "http://www.flashtool.net/";
+    description = "S1 flashing software for Sony phones from X10 to Xperia Z Ultra";
+
+    platforms = stdenv.lib.platforms.linux;
+    hydraPlatforms = stdenv.lib.platforms.none;
+    maintainers = [ stdenv.lib.maintainers.simons ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a113188cacd..7e013cab7c0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -925,6 +925,11 @@ let
 
   fio = callPackage ../tools/system/fio { };
 
+  flashtool = callPackage_i686 ../development/mobile/flashtool {
+    androidsdk = pkgs.pkgsi686Linux.androidsdk_4_1;
+    inherit (pkgs.pkgsi686Linux.xlibs) libXtst;
+  };
+
   flpsed = callPackage ../applications/editors/flpsed { };
 
   flvstreamer = callPackage ../tools/networking/flvstreamer { };