diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cd93c2c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+release
+build_release
diff --git a/.gitmodules b/.gitmodules
index 852c02c..bbac78c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "pico-keys-sdk"]
 	path = pico-keys-sdk
 	url = https://github.com/polhenarejos/pico-keys-sdk
+[submodule "pico-sdk"]
+	path = pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk.git
diff --git a/build_pico_fido.sh b/build_pico_fido.sh
index 04945c3..234882a 100755
--- a/build_pico_fido.sh
+++ b/build_pico_fido.sh
@@ -50,7 +50,9 @@ for board in adafruit_feather_rp2040 \
     wiznet_w5100s_evb_pico
 do
     rm -rf *
-    PICO_SDK_PATH=../../pico-sdk cmake .. -DPICO_BOARD=$board
+    # PICO_SDK_PATH=../../pico-sdk cmake .. -DPICO_BOARD=$board
+    PICO_SDK_PATH=../pico-sdk cmake .. -DPICO_BOARD=$board
+
     make -kj20
     mv pico_fido.uf2 ../release/pico_fido_$board-$VERSION_MAJOR.$VERSION_MINOR.uf2
 
diff --git a/build_release/.gitkeep b/build_release/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/pico-sdk b/pico-sdk
new file mode 160000
index 0000000..6a7db34
--- /dev/null
+++ b/pico-sdk
@@ -0,0 +1 @@
+Subproject commit 6a7db34ff63345a7badec79ebea3aaef1712f374
diff --git a/release/.gitkeep b/release/.gitkeep
new file mode 100644
index 0000000..e69de29