diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 75cd460..07ee36f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -3,17 +3,27 @@ on: workflow_dispatch
 
 jobs:
   release_job:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     name: Build Release
     steps:
       - uses: actions/checkout@v2
       - name: Build
-        # note: crossbuild-essential-armhf on 18.04 is GCC-7.2, on 20.04 GCC-9.2
-        # GCC-7.2 has GLIBC trouble on SoapyRemote avahi linking
-        # GCC-9.2 has stropts.h trouble with socat
+        # crossbuild-essential-armhf on 22.04 is GCC-11.2 (also has 10.5, 9.5)
+        # on 20.04 GCC-9.2 (also has 8), on 18.04 is GCC-7.2
+        # crossbuild-essential-armhf on Bookworm is GCC-12.2 (also has 11.3)
+        # on Bullseye GCC-10.3 (also has 9), on Buster is GCC-8.3
+        # note: GCC-9+ currently do not work with (GCC 7.3 built) sysroot 0.38.
+        # Note the GLIBC (libc6-dev-armhf-cross) version mismatch:
+        # buster has 2.28, bullseye has 2.31, bookworm has 2.36
+        # focal (20.04) has 2.31, jammy (22.04) has 2.35
+        # note: GCC-7.2 has GLIBC trouble on SoapyRemote avahi linking
+        # run: |
+        #   sudo apt-get install -y git rsync gcc-8-arm-linux-gnueabihf g++-8-arm-linux-gnueabihf cmake scons autoconf bison yodl python3-distutils
+        #   sudo update-alternatives --install /usr/bin/arm-linux-gnueabihf-gcc arm-linux-gnueabihf-gcc /usr/bin/arm-linux-gnueabihf-gcc-8 100 --slave /usr/bin/arm-linux-gnueabihf-g++ arm-linux-gnueabihf-g++ /usr/bin/arm-linux-gnueabihf-g++-8
         run: |
-          sudo apt-get install -y git rsync gcc-8-arm-linux-gnueabihf g++-8-arm-linux-gnueabihf cmake scons autoconf bison yodl
-          sudo update-alternatives --install /usr/bin/arm-linux-gnueabihf-gcc arm-linux-gnueabihf-gcc /usr/bin/arm-linux-gnueabihf-gcc-8 100 --slave /usr/bin/arm-linux-gnueabihf-g++ arm-linux-gnueabihf-g++ /usr/bin/arm-linux-gnueabihf-g++-8
+          sudo apt-get install -y git rsync cmake scons autoconf bison yodl python3-distutils
+          wget https://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/arm-linux-gnueabihf/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
+          tar xf gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
           ./build.sh
       - name: Get Release tag
         run: echo "RELEASE_VERSION=$(date +%F)" >> $GITHUB_ENV
diff --git a/README.md b/README.md
index 594df20..1c62ae3 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,15 @@ Let me know what other tools would be useful.
 Download [a Release](https://github.com/triq-org/PlutoSDR-Apps/releases),
 then copy to the Pluto and unpack to `/usr`
 
+```
+$ wget https://github.com/triq-org/PlutoSDR-Apps/releases/download/2024-02-23/plutosdr-apps-2024-02-23.tar.gz
+$ gzip -dc plutosdr-apps-2024-02-23.tar.gz |ssh root@pluto "cd /usr ; tar xv"
+$ ssh root@pluto
+# SoapySDRUtil --args="driver=plutosdr" --rate=50000000 --direction=RX
+# SoapySDRServer --bind
+$ SoapySDRUtil --args="driver=remote,remote=192.168.2.1,remote:driver=plutosdr" --rate=4000000 --direction=RX
+```
+
 ## Notes on the compiler toolchain
 
 If you want to compile yourself you need a compiler toolchain.
@@ -37,11 +46,21 @@ Toolchain path will be `/usr` and is already setup.
 
 You can use the ARM.com (previously Linaro) supplied compiler.
 
-See [GNU Toolchain for the A-profile Architecture](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads/8-2-2019-01).
-You want the download "AArch32 target with hard float (arm-linux-gnueabihf)", then just unpack.
+See [GNU Toolchain for the A-profile Architecture](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads).
+The `8.2-2019.01` version could work. You want the download "AArch32 target with hard float (arm-linux-gnueabihf)", then just unpack.
 
 Toolchain path will be `DESTDIR/gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabihf`
 
+## Using GNU Toolchain releases from Linaro
+
+Newer versions of the Pluto firmware don't use GCC 8.2.0 anymore but GCC 7.3 now.
+
+See [Arm GNU Toolchain Downloads](https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads)
+for [GNU Toolchain releases from Linaro (discontinued)](https://releases.linaro.org/components/toolchain/binaries/).
+The `7.3-2018.05` version should work. You want the download "arm-linux-gnueabihf", then just unpack.
+
+Toolchain path will be `DESTDIR/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf`
+
 ### Using Xilinx 2019.1 SDK toolchain
 
 You can use the Xilinix provided compiler.
diff --git a/build.sh b/build.sh
index 01a1caa..5ce75aa 100755
--- a/build.sh
+++ b/build.sh
@@ -2,6 +2,8 @@
 
 set -e
 
+FIRMWARE=${FIRMWARE:=0.38}
+
 export builddir="${builddir:-$(pwd)}"
 
 date +%F >"${builddir}/RELEASE-VERSION.txt"
@@ -21,6 +23,12 @@ if [ -z "${tools}" -a -d "gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabihf" ] ; th
   echo '- Compiler: gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabihf' >>"${releaseinfo}"
 fi
 
+if [ -z "${tools}" -a -d "gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf" ] ; then
+  export tools="${builddir}/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf"
+  export PATH="${tools}/bin:$PATH"
+  echo '- Compiler: gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf' >>"${releaseinfo}"
+fi
+
 if [ -z "${tools}" -a -d "/opt/Xilinx/SDK/2019.1/gnu/aarch32/lin/gcc-arm-linux-gnueabi" ] ; then
   export tools="/opt/Xilinx/SDK/2019.1/gnu/aarch32/lin/gcc-arm-linux-gnueabi"
   export PATH="${tools}/bin:$PATH"
@@ -33,70 +41,83 @@ if [ -z "${tools}" ] ; then
   echo 'Or a standalone toolchain:'
   echo '$ wget https://developer.arm.com/-/media/Files/downloads/gnu-a/8.2-2019.01/gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabihf.tar.xz'
   echo '$ tar xf gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabihf.tar.xz'
+  echo 'Or for newer firmware versions:'
+  echo '$ wget https://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/arm-linux-gnueabihf/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz'
+  echo '$ tar xf gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz'
   exit 1
 fi
 
 # Setup Sysroot
 
 if [ ! -d staging ] ; then
-  [ -f sysroot-v0.34.tar.gz ] || wget https://github.com/analogdevicesinc/plutosdr-fw/releases/download/v0.34/sysroot-v0.34.tar.gz
-  tar xzf sysroot-v0.34.tar.gz
+  [ -f sysroot-v${FIRMWARE}.tar.gz ] || wget https://github.com/analogdevicesinc/plutosdr-fw/releases/download/v${FIRMWARE}/sysroot-v${FIRMWARE}.tar.gz
+  tar xzf sysroot-v${FIRMWARE}.tar.gz
 fi
-echo '- plutosdr-fw: sysroot v0.34' >>"${releaseinfo}"
+echo "- plutosdr-fw: sysroot v${FIRMWARE}" >>"${releaseinfo}"
 export sysroot="${sysroot:-${builddir}/staging}"
 export stagedir="${stagedir:-${builddir}/stage}"
 export toolchain="${toolchain:-${builddir}/Toolchain-arm-linux-gnueabi.cmake}"
 
 # Compile Apps
 
-[ -d SoapySDR ] || git clone https://github.com/pothosware/SoapySDR.git
+#export CFLAGS="-Werror"
+#export CXXFLAGS="-Werror -Wno-psabi"
+
+[ -d SoapySDR ] || git clone --depth 1 https://github.com/pothosware/SoapySDR.git
 pushd SoapySDR
 echo -n '- SoapySDR: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
-rm -rf build ; mkdir build ; pushd build
-cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DENABLE_PYTHON=OFF -DENABLE_PYTHON3=OFF .. && make && make install
-popd ; popd
+rm -rf build ; mkdir build
+cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DENABLE_PYTHON=OFF -DENABLE_PYTHON3=OFF -B build
+cmake --build build -- install
+popd
 
-[ -d SoapyPlutoSDR ] || git clone https://github.com/pothosware/SoapyPlutoSDR.git
+[ -d SoapyPlutoSDR ] || git clone --depth 1 https://github.com/pothosware/SoapyPlutoSDR.git
 pushd SoapyPlutoSDR
 echo -n '- SoapyPlutoSDR: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
-rm -rf build ; mkdir build ; pushd build
-cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" .. && make && make install
-popd ; popd
+rm -rf build ; mkdir build
+cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" -B build
+cmake --build build -- install
+popd
 
-[ -d SoapyRemote ] || git clone https://github.com/pothosware/SoapyRemote.git
+[ -d SoapyRemote ] || git clone --depth 1 https://github.com/pothosware/SoapyRemote.git
 pushd SoapyRemote
 echo -n '- SoapyRemote: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
-rm -rf build ; mkdir build ; pushd build
-cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" .. && make && make install
-popd ; popd
+rm -rf build ; mkdir build
+cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" -B build
+cmake --build build -- install
+popd
 
-[ -d rtl_433 ] || git clone https://github.com/merbanan/rtl_433.git
+[ -d rtl_433 ] || git clone --depth 1 https://github.com/merbanan/rtl_433.git
 pushd rtl_433
 echo -n '- rtl_433: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
-rm -rf build ; mkdir build ; pushd build
-cmake -DENABLE_RTLSDR=OFF -DENABLE_SOAPYSDR=ON -DENABLE_OPENSSL=OFF -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" .. && make && make install
-popd ; popd
+rm -rf build ; mkdir build
+cmake -DENABLE_RTLSDR=OFF -DENABLE_SOAPYSDR=ON -DENABLE_OPENSSL=OFF -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" -B build
+cmake --build build -- install
+popd
 
-[ -d rx_tools ] || git clone https://github.com/rxseger/rx_tools.git
+[ -d rx_tools ] || git clone --depth 1 https://github.com/rxseger/rx_tools.git
 pushd rx_tools
 echo -n '- rx_tools: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
-rm -rf build ; mkdir build ; pushd build
-cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" .. && make && make install
-popd ; popd
+rm -rf build ; mkdir build
+cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" -B build
+cmake --build build -- install
+popd
 
-[ -d tx_tools ] || git clone https://github.com/triq-org/tx_tools.git
+[ -d tx_tools ] || git clone --depth 1 https://github.com/triq-org/tx_tools.git
 pushd tx_tools
 echo -n '- tx_tools: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
-rm -rf build ; mkdir build ; pushd build
-cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" .. && make && make install
-popd ; popd
+rm -rf build ; mkdir build
+cmake -DCMAKE_TOOLCHAIN_FILE="${toolchain}" -DCMAKE_INSTALL_PREFIX=/usr -DSoapySDR_DIR="${stagedir}/share/cmake/SoapySDR" -B build
+cmake --build build -- install
+popd
 
+# Note: dumb http transport does not support shallow capabilities
 [ -d chrony ] || git clone https://git.tuxfamily.org/chrony/chrony.git
 pushd chrony
 echo -n '- chrony: ' >>"${releaseinfo}"
@@ -108,7 +129,7 @@ make
 cp -a chronyc chronyd "${stagedir}/bin/"
 popd
 
-[ -d gpsd ] || git clone git://git.savannah.gnu.org/gpsd.git
+[ -d gpsd ] || git clone --depth 1 git://git.savannah.gnu.org/gpsd.git
 pushd gpsd
 echo -n '- gpsd: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
@@ -116,7 +137,7 @@ git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${relea
 DESTDIR="${stagedir}" scons libgpsmm=No ncurses=No python=No sbindir=bin prefix=/ sysroot="${sysroot}" target=arm-linux-gnueabihf build install
 popd
 
-[ -d iperf ] || git clone https://github.com/esnet/iperf.git
+[ -d iperf ] || git clone --depth 1 https://github.com/esnet/iperf.git
 pushd iperf
 echo -n '- iperf: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"
@@ -125,7 +146,7 @@ make
 make install DESTDIR=${stagedir} prefix=/
 popd
 
-[ -d socat ] || git clone git://repo.or.cz/socat.git
+[ -d socat ] || git clone --depth 1 git://repo.or.cz/socat.git
 pushd socat
 echo -n '- socat: ' >>"${releaseinfo}"
 git describe --tags --first-parent --abbrev=7 --long --dirty --always >>"${releaseinfo}"