diff --git a/pkgs/by-name/gl/glasgow/package.nix b/pkgs/by-name/gl/glasgow/package.nix
index c193c2029b45..09ce3f00a1f9 100644
--- a/pkgs/by-name/gl/glasgow/package.nix
+++ b/pkgs/by-name/gl/glasgow/package.nix
@@ -1,33 +1,16 @@
 {
   lib,
-  python3,
+  python3Packages,
   fetchFromGitHub,
-  fetchPypi,
-  sdcc,
-  yosys,
   icestorm,
   nextpnr,
+  sdcc,
+  yosys,
 }:
 
-let
-  # glasgow uses importlib_resources' open_text(), removed in 7.x; pin it to 6.x.
-  pythonPackages = python3.pkgs.overrideScope (
-    final: prev: {
-      importlib-resources = prev.importlib-resources.overridePythonAttrs (old: rec {
-        version = "6.5.2";
-        src = fetchPypi {
-          pname = "importlib_resources";
-          inherit version;
-          hash = "sha256-GF+Hre9bzCiESdmPtPugfOp4vANkVd1ExfxKL+eP7Sw=";
-        };
-        doCheck = false;
-      });
-    }
-  );
-in
-pythonPackages.buildPythonApplication rec {
+python3Packages.buildPythonApplication rec {
   pname = "glasgow";
-  version = "0-unstable-2025-12-22";
+  version = "0-unstable-2025-07-25";
   # Similar to `pdm show`, but without the commit counter
   pdmVersion =
     let
@@ -35,17 +18,17 @@ pythonPackages.buildPythonApplication rec {
       rev = lib.substring 0 7 src.rev;
     in
     "${tag}.1.dev0+g${rev}";
-  # The latest commit ID touching the `firmware` directory, before a "deploy firmware" commit.
-  # Differs from rev!
-  firmwareGitRev = "8b5afc70";
+  # Usually the latest commit ID touching the `firmware` directory. Differs from src/rev!
+  # Run `git log -1 --abbrev=8 --pretty=%h HEAD .` inside the firmware/fx2 dir.
+  firmwareGitRev = "12b5cfb3";
 
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "GlasgowEmbedded";
     repo = "glasgow";
-    rev = "ccee116d8b59f25ed0874d152f6b9f9974b185f1";
-    hash = "sha256-2fF0lPfRtpci76q4fEhWAwLBXP0kfIP3dH5z8u/+yd8=";
+    rev = "c424688ff0d7faee49198bbdb2a34b1026534350";
+    hash = "sha256-0pVQg3FSBQ8A4eLnAxFdicOiCvAYmKwHnSoLGx1MLxM=";
   };
 
   nativeBuildInputs = [
@@ -53,13 +36,14 @@ pythonPackages.buildPythonApplication rec {
   ];
 
   build-system = [
-    pythonPackages.pdm-backend
+    python3Packages.pdm-backend
   ];
 
-  dependencies = with pythonPackages; [
+  dependencies = with python3Packages; [
     aiohttp
     amaranth
     cobs
+    enum-tools
     fx2
     importlib-resources
     libusb1
@@ -67,11 +51,12 @@ pythonPackages.buildPythonApplication rec {
     platformdirs
     pyvcd
     typing-extensions
+    tqdm
   ];
 
   nativeCheckInputs = [
     # pytestCheckHook discovers way less tests
-    pythonPackages.unittestCheckHook
+    python3Packages.unittestCheckHook
     icestorm
     nextpnr
     yosys
@@ -84,16 +69,16 @@ pythonPackages.buildPythonApplication rec {
   __darwinAllowLocalNetworking = true;
 
   preBuild = ''
-    make -C firmware GIT_REV_SHORT=${firmwareGitRev} LIBFX2=${pythonPackages.fx2}/share/libfx2
+    make -C firmware/fx2 GIT_TREE_DIRTY=0 GIT_REV_SHORT=${firmwareGitRev} LIBFX2=${python3Packages.fx2}/share/libfx2
 
     # Normalize the .ihex file, see ./software/deploy-firmware.sh.
-    ${pythonPackages.python.withPackages (p: [ p.fx2 ])}/bin/python firmware/normalize.py \
-      firmware/glasgow.ihex firmware/glasgow.ihex
+    ${python3Packages.python.withPackages (p: [ p.fx2 ])}/bin/python firmware/fx2/normalize.py \
+      firmware/fx2/build/firmware.ihex firmware/fx2/glasgow.ihex
 
     # Ensure the compiled firmware is exactly the same as the one shipped in the repo.
-    if ! cmp -s firmware/glasgow.ihex software/glasgow/hardware/firmware.ihex; then
+    if ! cmp -s firmware/fx2/glasgow.ihex software/glasgow/hardware/firmware-fx2.ihex; then
       echo >&2 "Firmware doesn't reproduce!"
-      diff -u software/glasgow/hardware/firmware.ihex firmware/glasgow.ihex
+      diff -u software/glasgow/hardware/firmware-fx2.ihex firmware/fx2/glasgow.ihex
       exit 1
     fi