diff --git a/CMakeLists.txt b/CMakeLists.txt
index f885ccf..ea3af23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,6 +22,7 @@ if(ESP_PLATFORM)
     include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 else()
     if(NOT ENABLE_EMULATION)
+        set(PICO_USE_FASTEST_SUPPORTED_CLOCK 1)
         include(pico_sdk_import.cmake)
     endif()
 
diff --git a/build_pico_hsm.sh b/build_pico_hsm.sh
index 9a388c5..7e71c4c 100755
--- a/build_pico_hsm.sh
+++ b/build_pico_hsm.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 VERSION_MAJOR="5"
-VERSION_MINOR="2-eddsa1"
+VERSION_MINOR="4-eddsa1"
 SUFFIX="${VERSION_MAJOR}.${VERSION_MINOR}"
 #if ! [[ -z "${GITHUB_SHA}" ]]; then
 #    SUFFIX="${SUFFIX}.${GITHUB_SHA}"
@@ -11,98 +11,13 @@ rm -rf release/*
 mkdir -p build_release
 mkdir -p release
 cd build_release
-
-for board in 0xcb_helios \
-    adafruit_feather_rp2040_usb_host \
-    adafruit_feather_rp2040 \
-    adafruit_itsybitsy_rp2040 \
-    adafruit_kb2040 \
-    adafruit_macropad_rp2040 \
-    adafruit_qtpy_rp2040 \
-    adafruit_trinkey_qt2040 \
-    amethyst_fpga \
-    archi \
-    arduino_nano_rp2040_connect \
-    cytron_maker_pi_rp2040 \
-    datanoisetv_rp2040_dsp \
-    eetree_gamekit_rp2040 \
-    garatronic_pybstick26_rp2040 \
-    gen4_rp2350_24 \
-    gen4_rp2350_24ct \
-    gen4_rp2350_24t \
-    gen4_rp2350_28 \
-    gen4_rp2350_28ct \
-    gen4_rp2350_28t \
-    gen4_rp2350_32 \
-    gen4_rp2350_32ct \
-    gen4_rp2350_32t \
-    gen4_rp2350_35 \
-    gen4_rp2350_35ct \
-    gen4_rp2350_35t \
-    hellbender_2350A_devboard \
-    ilabs_challenger_rp2350_bconnect \
-    ilabs_challenger_rp2350_wifi_ble \
-    ilabs_opendec02 \
-    melopero_perpetuo_rp2350_lora \
-    melopero_shake_rp2040 \
-    metrotech_xerxes_rp2040 \
-    net8086_usb_interposer \
-    nullbits_bit_c_pro \
-    phyx_rick_tny_rp2350 \
-    pi-plates_micropi \
-    pico \
-    pico_w \
-    pico2 \
-    pimoroni_badger2040 \
-    pimoroni_interstate75 \
-    pimoroni_keybow2040 \
-    pimoroni_motor2040 \
-    pimoroni_pga2040 \
-    pimoroni_pga2350 \
-    pimoroni_pico_plus2_rp2350 \
-    pimoroni_picolipo_4mb \
-    pimoroni_picolipo_16mb \
-    pimoroni_picosystem \
-    pimoroni_plasma2040 \
-    pimoroni_plasma2350 \
-    pimoroni_servo2040 \
-    pimoroni_tiny2040 \
-    pimoroni_tiny2040_2mb \
-    pimoroni_tiny2350 \
-    pololu_3pi_2040_robot \
-    pololu_zumo_2040_robot \
-    seeed_xiao_rp2040 \
-    seeed_xiao_rp2350 \
-    solderparty_rp2040_stamp \
-    solderparty_rp2040_stamp_carrier \
-    solderparty_rp2040_stamp_round_carrier \
-    solderparty_rp2350_stamp_xl \
-    solderparty_rp2350_stamp \
-    sparkfun_micromod \
-    sparkfun_promicro \
-    sparkfun_promicro_rp2350 \
-    sparkfun_thingplus \
-    switchscience_picossci2_conta_base \
-    switchscience_picossci2_dev_board \
-    switchscience_picossci2_micro \
-    switchscience_picossci2_rp2350_breakout \
-    switchscience_picossci2_tiny \
-    tinycircuits_thumby_color_rp2350 \
-    vgaboard \
-    waveshare_rp2040_lcd_0.96 \
-    waveshare_rp2040_lcd_1.28 \
-    waveshare_rp2040_one \
-    waveshare_rp2040_plus_4mb \
-    waveshare_rp2040_plus_16mb \
-    waveshare_rp2040_zero \
-    weact_studio_rp2040_2mb \
-    weact_studio_rp2040_4mb \
-    weact_studio_rp2040_8mb \
-    weact_studio_rp2040_16mb \
-    wiznet_w5100s_evb_pico
+PICO_SDK_PATH="${PICO_SDK_PATH:-../../pico-sdk}"
+board_dir=${PICO_SDK_PATH}/src/boards/include/boards
+for board in "$board_dir"/*
 do
+    board_name="$(basename -- $board .h)"
     rm -rf *
-    PICO_SDK_PATH="${PICO_SDK_PATH:-../../pico-sdk}" cmake .. -DPICO_BOARD=$board
+    PICO_SDK_PATH="${PICO_SDK_PATH}" cmake .. -DPICO_BOARD=$board_name
     make -j`nproc`
-    mv pico_hsm.uf2 ../release/pico_hsm_$board-$SUFFIX.uf2
+    mv pico_hsm.uf2 ../release/pico_hsm_$board_name-$SUFFIX.uf2
 done
diff --git a/pico-keys-sdk b/pico-keys-sdk
index edc2b3a..4120a8c 160000
--- a/pico-keys-sdk
+++ b/pico-keys-sdk
@@ -1 +1 @@
-Subproject commit edc2b3a4985a8cc95880e1d2b42b5aec9d793bbf
+Subproject commit 4120a8c1a61a0a63040a83522133a10cd9a75e5a
diff --git a/src/hsm/cmd_extras.c b/src/hsm/cmd_extras.c
index c97e2be..fe89ee4 100644
--- a/src/hsm/cmd_extras.c
+++ b/src/hsm/cmd_extras.c
@@ -235,14 +235,9 @@ int cmd_extras() {
             else {
                 return SW_INCORRECT_P1P2();
             }
-            uint8_t tmp[PHY_MAX_SIZE];
-            uint16_t tmp_len = 0;
-            memset(tmp, 0, sizeof(tmp));
-            if (phy_serialize_data(&phy_data, tmp, &tmp_len) != PICOKEY_OK) {
+            if (phy_save() != PICOKEY_OK) {
                 return SW_EXEC_ERROR();
             }
-            file_put_data(ef_phy, tmp, tmp_len);
-            low_flash_available();
         }
     }
 #endif
diff --git a/src/hsm/version.h b/src/hsm/version.h
index 615e7ea..1d32f94 100644
--- a/src/hsm/version.h
+++ b/src/hsm/version.h
@@ -18,7 +18,7 @@
 #ifndef __VERSION_H_
 #define __VERSION_H_
 
-#define HSM_VERSION 0x0502
+#define HSM_VERSION 0x0504
 
 #define HSM_VERSION_MAJOR ((HSM_VERSION >> 8) & 0xff)
 #define HSM_VERSION_MINOR (HSM_VERSION & 0xff)
diff --git a/workflows/autobuild.sh b/workflows/autobuild.sh
index 8daf6ea..f872cd9 100755
--- a/workflows/autobuild.sh
+++ b/workflows/autobuild.sh
@@ -7,7 +7,7 @@ if [[ $1 == "pico" ]]; then
 sudo apt install -y cmake gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib
 git clone https://github.com/raspberrypi/pico-sdk
 cd pico-sdk
-git checkout tags/2.1.0
+git checkout tags/2.1.1
 git submodule update --init
 cd ..
 git clone https://github.com/raspberrypi/picotool
@@ -37,6 +37,16 @@ mkdir -p release
 cd build
 esptool.py --chip ESP32-S3 merge_bin -o ../release/pico_hsm_esp32-s3.bin @flash_args
 cd ..
+cd esp-idf
+./install.sh esp32s2
+. ./export.sh
+cd ..
+idf.py set-target esp32s2
+idf.py all
+mkdir -p release
+cd build
+esptool.py --chip ESP32-S2 merge_bin -o ../release/pico_hsm_esp32-s2.bin @flash_args
+cd ..
 else
 mkdir build
 cd build