diff --git a/microsoft/surface/firmware/ath10k.nix b/microsoft/surface/firmware/ath10k.nix
index 3cbd8a0..db23507 100644
--- a/microsoft/surface/firmware/ath10k.nix
+++ b/microsoft/surface/firmware/ath10k.nix
@@ -1,13 +1,15 @@
 {stdenv, pkgs, firmwareLinuxNonfree, ...}:
 let
   repos = (pkgs.callPackage ../repos.nix {});
+  ath10k = ./ath10k;
+  # ath10k = repos.ath10k-firmware;
 in
 
 firmwareLinuxNonfree.overrideAttrs (old: rec {
   pname = "microsoft-surface-go-firmware-linux-nonfree";
   srcs = [
     firmwareLinuxNonfree.src
-    repos.ath10k-firmware
+    ath10k
   ];
 
   sourceRoot = firmwareLinuxNonfree.src;
@@ -15,15 +17,12 @@ firmwareLinuxNonfree.overrideAttrs (old: rec {
 
   dontMakeSourcesWritable = true;
   postInstall = ''
-    # rm -v $out/lib/firmware/ath10k/{hw2.1,hw3.0}/board.bin
-    # rm -v $out/lib/firmware/ath10k/{hw2.1,hw3.0}/board2.bin
+    # Delete the non-working firmware:
+    rm -v $out/lib/firmware/ath10k/QCA6174/{hw2.1,hw3.0}/board.bin
+    rm -v $out/lib/firmware/ath10k/QCA6174/{hw2.1,hw3.0}/board-2.bin
 
-    # cp $srcs[1] $out/lib/firmware/ath10k/hw2.1/
-    # cp $srcs[1] $out/lib/firmware/ath10k/hw3.0/
-
-    #TODO:
-    pwd
-    echo src = $src, srcs = $srcs
-    exit 1
+    # Install the Surface Go Wifi firmware:
+    cp ${ath10k}/K1535_Debian/board.bin $out/lib/firmware/ath10k/QCA6174/hw2.1/
+    cp ${ath10k}/K1535_Debian/board.bin $out/lib/firmware/ath10k/QCA6174/hw3.0/
   '';
 })
diff --git a/microsoft/surface/firmware/ath10k/K1535_Debian/board.bin b/microsoft/surface/firmware/ath10k/K1535_Debian/board.bin
new file mode 100644
index 0000000..ed0b7f7
Binary files /dev/null and b/microsoft/surface/firmware/ath10k/K1535_Debian/board.bin differ