diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 41dbfc1..0f7f5b6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -75,12 +75,13 @@ jobs:
       - uses: actions/download-artifact@v8
         with:
           name: release-assets
-          path: assets
+          # Not "assets/": the checkout already has an assets/ directory.
+          path: release-assets
       - name: Checksums and signature
         env:
           RELEASE_SIGNING_KEY: ${{ secrets.RELEASE_SIGNING_KEY }}
         run: |
-          cd assets
+          cd release-assets
           sha256sum -- * > SHA256SUMS
           if [ -n "$RELEASE_SIGNING_KEY" ]; then
             export GNUPGHOME="$RUNNER_TEMP/gnupg"
@@ -107,4 +108,4 @@ jobs:
           body_path: ${{ steps.notes.outputs.path }}
           generate_release_notes: ${{ steps.notes.outputs.path == '' }}
           prerelease: ${{ contains(env.VERSION, '-') }}
-          files: assets/*
+          files: release-assets/*
diff --git a/ci/firmware/Dockerfile b/ci/firmware/Dockerfile
index b2aa197..ea7791e 100644
--- a/ci/firmware/Dockerfile
+++ b/ci/firmware/Dockerfile
@@ -9,12 +9,14 @@ ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
-        bc bison build-essential ca-certificates ccache clang cmake cpio curl \
+        android-sdk-libsparse-utils bc bison btrfs-progs build-essential ca-certificates \
+        ccache clang cmake cpio curl fdisk swig \
         device-tree-compiler dosfstools dwarves e2fsprogs exfatprogs fakeroot file flex \
         gcc-arm-linux-gnueabihf git git-lfs gperf kmod libclang-dev \
         libdbus-1-dev libelf-dev libgmp-dev libmpc-dev libncurses-dev \
         libnl-3-dev libssl-dev llvm-dev lz4 openssl parted patch \
-        pkg-config python-is-python3 python3 python3-pip rsync sudo texinfo \
+        pkg-config python-is-python3 python3 python3-dev python3-pip python3-pyelftools \
+        rsync sudo texinfo \
         u-boot-tools udev unzip uuid-dev wget xz-utils zstd \
     && rm -rf /var/lib/apt/lists/*