diff --git a/scripts/prepare_zephyr_env.sh b/scripts/prepare_zephyr_env.sh
index a844ee0..35efb26 100755
--- a/scripts/prepare_zephyr_env.sh
+++ b/scripts/prepare_zephyr_env.sh
@@ -12,15 +12,23 @@ PROJECT_ROOT=$(realpath $(pwd))
 
 # setup SDK
 if [ ! -d "$ZEPHYR_SDK_PATH" ]; then
-  # determine latest SDK version
-  ZEPHYR_SDK_VERSION=$(curl "https://api.github.com/repos/zephyrproject-rtos/sdk-ng/tags" | jq -r '[.[].name | select(.|test("-")|not)][0]')
-  ZEPHYR_SDK_VERSION="${ZEPHYR_SDK_VERSION:1}"
+  cd /tmp
+  for SDK_IDX in 0 1 2
+  do
+    # determine latest SDK version
+    ZEPHYR_SDK_VERSION=$(curl "https://api.github.com/repos/zephyrproject-rtos/sdk-ng/tags" | jq -r "[.[].name | select(.|test(\"-\")|not)][$SDK_IDX]")
+    ZEPHYR_SDK_VERSION="${ZEPHYR_SDK_VERSION:1}"
 
-  ZEPHYR_SDK_ARCHIVE="zephyr-sdk-${ZEPHYR_SDK_VERSION}_linux-x86_64_minimal.tar.xz"
+    ZEPHYR_SDK_ARCHIVE="zephyr-sdk-${ZEPHYR_SDK_VERSION}_linux-x86_64_minimal.tar.xz"
 
+    WGET_RETVAL=0
+    wget "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${ZEPHYR_SDK_VERSION}/${ZEPHYR_SDK_ARCHIVE}" || WGET_RETVAL=$?
+    if [ "$WGET_RETVAL" -eq 0 ]; then
+      break
+    fi
+    echo "Fallback to older SDK version"
+  done
   mkdir -p $(dirname $ZEPHYR_SDK_PATH)
-  cd /tmp
-  wget "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${ZEPHYR_SDK_VERSION}/${ZEPHYR_SDK_ARCHIVE}"
   tar xvf ${ZEPHYR_SDK_ARCHIVE}
   mv ./zephyr-sdk-${ZEPHYR_SDK_VERSION} ${ZEPHYR_SDK_PATH}
   rm ${ZEPHYR_SDK_ARCHIVE}
@@ -36,7 +44,7 @@ fi
 
 cd ${PROJECT_ROOT}
 # setup Zephyr project
-if [ ! -d ".west" ]; then
+if [ ! -d "../.west" ]; then
   west init -l .
   west update
   west zephyr-export