diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5089171..72abc2c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,9 +5,10 @@ jobs:
       runs-on: ubuntu-22.04
       env: 
         BUILD_TYPE: "Release"
-        PICOSDK_VER: "1.5.1"
-        PICOEXTRA_VER: "sdk-1.5.1"
+        PICOSDK_VER: "2.0.0"
+        PICOEXTRA_VER: "sdk-2.0.0"
         # The Pico-SDK will listen to these environment vars
+        PICOTOOL_FETCH_FROM_GIT_PATH: ${{github.workspace}}/pico/picotool
         PICO_SDK_PATH: ${{github.workspace}}/pico/pico-sdk
         PICO_EXTRAS_PATH: ${{github.workspace}}/pico/pico-extras
         OUTPUT_DIR: ${{github.workspace}}/binaries
@@ -20,7 +21,7 @@ jobs:
       - name: Install Arm GNU Toolchain (arm-none-eabi-gcc)
         uses: carlosperate/arm-none-eabi-gcc-action@v1
         with:
-          release: '13.2.Rel1'
+          release: '13.3.Rel1'
 
       # Since we reference stable versions of Pico-SDK and pico-extras, we can cache their downloads.
       # If this were to reference changing branches (like "master"), this caching step must be removed!!!
diff --git a/sw/CMakeLists.txt b/sw/CMakeLists.txt
index ceccd91..a0b9c63 100644
--- a/sw/CMakeLists.txt
+++ b/sw/CMakeLists.txt
@@ -2,6 +2,9 @@
 
 cmake_minimum_required(VERSION 3.13)
 
+set(PICO_BOARD_HEADER_DIRS ${CMAKE_CURRENT_LIST_DIR})
+set(PICO_BOARD pico_w)
+set(PICO_COPY_TO_RAM 1)
 
 # Initialise pico_sdk from installed location
 # (note this can come from environment, CMake cache etc)
@@ -22,10 +25,6 @@ set(CMAKE_CXX_STANDARD 17)
 
 include(pico_extras_import.cmake)
 
-set(PICO_BOARD_HEADER_DIRS ${CMAKE_CURRENT_LIST_DIR})
-set(PICO_BOARD PICO_W)
-set(PICO_COPY_TO_RAM 1)
-
 # Tell the Pico SDK to use our local tinyusb instead of the one included in the SDK
 # This is needed to support tusb_xinput
 set(PICO_TINYUSB_PATH ${CMAKE_CURRENT_LIST_DIR}/tinyusb)
@@ -322,6 +321,9 @@ function(build_ne2000 TARGET_NAME MULTIFW)
     target_compile_definitions(${TARGET_NAME} PRIVATE
        NE2000=1
        PICOW=1
+       # CYW43_RESOURCE_ATTRIBUTE="__in_flash()"
+       CYW43_CONFIG_FILE="cyw43_firmware.h"
+       CYW43_PIO_CLOCK_DIV_INT=3
     )
     target_sources(${TARGET_NAME} PRIVATE
         ne2000play.cpp
@@ -329,6 +331,7 @@ function(build_ne2000 TARGET_NAME MULTIFW)
     target_link_libraries(
         ${TARGET_NAME}
         ne2000        
+        pico_cyw43_arch_none
     )
 endfunction()
 
diff --git a/sw/flash_settings.c b/sw/flash_settings.c
index db75980..cd6c687 100644
--- a/sw/flash_settings.c
+++ b/sw/flash_settings.c
@@ -4,6 +4,7 @@
 #include "flash_settings.h"
 #include "hardware/flash.h"
 #include "hardware/sync.h"
+#include "hardware/clocks.h"
 #include "pico/stdlib.h"
 #include "pico/flash.h"
 
diff --git a/sw/ne2000/CMakeLists.txt b/sw/ne2000/CMakeLists.txt
index 74ff96a..b3359e9 100644
--- a/sw/ne2000/CMakeLists.txt
+++ b/sw/ne2000/CMakeLists.txt
@@ -16,13 +16,13 @@ target_sources(ne2000 INTERFACE
 )
 
 target_link_libraries(ne2000 INTERFACE
-    # pico_cyw43_arch_none
-    pico_cyw43_arch_poll
+    pico_cyw43_arch_none
+    # pico_cyw43_arch_poll
 ) 
-target_compile_definitions(pico_cyw43_arch_poll_headers INTERFACE
-    CYW43_LWIP=0
-)
-target_compile_definitions(ne2000 INTERFACE
-    CYW43_LWIP=0
-)
+# target_compile_definitions(pico_cyw43_arch_poll_headers INTERFACE
+#     CYW43_LWIP=0
+# )
+# target_compile_definitions(ne2000 INTERFACE
+#     CYW43_LWIP=0
+# )
 
diff --git a/sw/ne2000/ne2000.c b/sw/ne2000/ne2000.c
index 65eba21..877866c 100644
--- a/sw/ne2000/ne2000.c
+++ b/sw/ne2000/ne2000.c
@@ -66,6 +66,8 @@ char WIFI_SSID[33];
 char WIFI_KEY[63];
 */
 
+uint16_t pbuf_copy_partial(const struct pbuf *p, void *dataptr, uint16_t len, uint16_t offset) {}
+
 
 #define CYW43_LINK_DOWN         (0)     ///< link is down
 #define CYW43_LINK_JOIN         (1)     ///< Connected to wifi
diff --git a/sw/ne2000play.cpp b/sw/ne2000play.cpp
index dcd292f..b5a2863 100644
--- a/sw/ne2000play.cpp
+++ b/sw/ne2000play.cpp
@@ -52,7 +52,7 @@ void play_ne2000() {
                 break;
             }
         }
-        cyw43_arch_poll();
+        /* cyw43_arch_poll(); */
         /*
         if (((time_us_32() >> 21) & 0x1) == 0x1) { 
             if (flag == false) {
diff --git a/sw/pico_extras_import.cmake b/sw/pico_extras_import.cmake
index 706add0..b75b9b3 100644
--- a/sw/pico_extras_import.cmake
+++ b/sw/pico_extras_import.cmake
@@ -26,14 +26,14 @@ if (NOT PICO_EXTRAS_PATH)
             get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_EXTRAS_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
         endif ()
         FetchContent_Declare(
-                PICO_EXTRAS
+                pico_extras
                 GIT_REPOSITORY https://github.com/raspberrypi/pico-extras
                 GIT_TAG master
         )
-        if (NOT PICO_EXTRAS)
-            message("Downloading PICO EXTRAS")
-            FetchContent_Populate(PICO_EXTRAS)
-            set(PICO_EXTRAS_PATH ${PICO_EXTRAS_SOURCE_DIR})
+        if (NOT pico_extras)
+            message("Downloading Raspberry Pi Pico Extras")
+            FetchContent_Populate(pico_extras)
+            set(PICO_EXTRAS_PATH ${pico_extras_SOURCE_DIR})
         endif ()
         set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
     else ()
@@ -59,4 +59,4 @@ endif ()
 
 set(PICO_EXTRAS_PATH ${PICO_EXTRAS_PATH} CACHE PATH "Path to the PICO EXTRAS" FORCE)
 
-add_subdirectory(${PICO_EXTRAS_PATH} pico_extras)
\ No newline at end of file
+add_subdirectory(${PICO_EXTRAS_PATH} pico_extras)
diff --git a/sw/pico_reflash.c b/sw/pico_reflash.c
index 5f0d0db..d87e896 100644
--- a/sw/pico_reflash.c
+++ b/sw/pico_reflash.c
@@ -2,6 +2,7 @@
 
 #include <stdio.h>
 #include <hardware/flash.h>
+#include "hardware/clocks.h"
 #include "pico/multicore.h"
 #include "pico/stdlib.h"
 
diff --git a/sw/pico_sdk_import.cmake b/sw/pico_sdk_import.cmake
index 65f8a6f..a0721d0 100644
--- a/sw/pico_sdk_import.cmake
+++ b/sw/pico_sdk_import.cmake
@@ -18,9 +18,20 @@ if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_P
     message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
 endif ()
 
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
+    set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
+    message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
+endif ()
+
+if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
+  set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
+  message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
+endif()
+
 set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
 set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
 set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
 
 if (NOT PICO_SDK_PATH)
     if (PICO_SDK_FETCH_FROM_GIT)
@@ -34,14 +45,14 @@ if (NOT PICO_SDK_PATH)
             FetchContent_Declare(
                     pico_sdk
                     GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
-                    GIT_TAG master
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
                     GIT_SUBMODULES_RECURSE FALSE
             )
         else ()
             FetchContent_Declare(
                     pico_sdk
                     GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
-                    GIT_TAG master
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
             )
         endif ()