diff --git a/chip-legacy-update.sh b/chip-legacy-update.sh
new file mode 100755
index 0000000..d6f2c64
--- /dev/null
+++ b/chip-legacy-update.sh
@@ -0,0 +1,159 @@
+#!/bin/bash
+
+SCRIPTDIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+source $SCRIPTDIR/common.sh
+
+if ! wait_for_fel; then
+  echo "ERROR: please jumper your CHIP in FEL mode then power on"
+  exit 1
+fi
+
+
+FLASH_SCRIPT=./chip-fel-flash.sh
+WHAT=buildroot
+BRANCH=stable
+
+function require_directory {
+  if [[ ! -d "${1}" ]]; then
+    mkdir -p "${1}"
+  fi
+}
+
+function s3_md5 {
+  local URL=$1
+  curl -sLI $URL |grep ETag|sed -e 's/.*"\([a-fA-F0-9]\+\)["-]*.*/\1/;'
+}
+
+function cache_download {
+  local DEST_DIR=${1}
+  local SRC_URL=${2}
+  local FILE=${3}
+
+  if [[ -f "${DEST_DIR}/${FILE}" ]]; then
+    echo "${DEST_DIR}/${FILE} exists... comparing to ${SRC_URL}/${FILE}"
+    local S3_MD5=$(s3_md5 ${SRC_URL}/${FILE})
+    local MD5=$(md5sum ${DEST_DIR}/${FILE} | cut -d\  -f1)
+    echo "MD5: ${MD5}"
+    echo "S3_MD5: ${S3_MD5}"
+    if [[ "${S3_MD5}" != "${MD5}" ]]; then
+      echo "md5sum differs"
+      rm ${DEST_DIR}/${FILE}
+      if ! wget -P "${FW_IMAGE_DIR}" "${SRC_URL}/${FILE}"; then
+        echo "download of ${SRC_URL}/${FILE} failed!"
+        exit $?
+      fi 
+    else
+      echo "file already downloaded"
+    fi
+  else
+    if ! wget -P "${FW_IMAGE_DIR}" "${SRC_URL}/${FILE}"; then
+      echo "download of ${SRC_URL}/${FILE} failed!"
+      exit $?
+    fi 
+  fi
+}
+    
+
+while getopts "ufdpb:w:B:" opt; do
+  case $opt in
+    u)
+      echo "updating cache"
+      if [[ -d "$FW_IMAGE_DIR" ]]; then
+        rm -rf $FW_IMAGE_DIR
+      fi
+      ;;
+    f)
+      echo "fastboot enabled"
+      FLASH_SCRIPT_OPTION="-f"
+      ;;
+    B)
+      BUILD="$OPTARG"
+      echo "BUILD = ${BUILD}"
+      ;;
+    b)
+      BRANCH="$OPTARG"
+      echo "BRANCH = ${BRANCH}"
+      ;;
+    w)
+      WHAT="$OPTARG"
+      echo "WHAT = ${WHAT}"
+      ;;
+    d)
+      echo "debian selected"
+      WHAT="debian"
+      ;;
+    p)
+      echo "PocketC.H.I.P selected"
+      WHAT="pocketchip"
+      BUILD=123
+      FLASH_SCRIPT=./chip-fel-flash.sh -p
+      ;;
+    \?)
+      echo "Invalid option: -$OPTARG" >&2
+      exit 1
+      ;;
+  esac
+done
+
+
+FW_DIR="$(pwd)/.firmware"
+FW_IMAGE_DIR="${FW_DIR}/images"
+BASE_URL="http://opensource.nextthing.co/chip"
+S3_URL="${BASE_URL}/${WHAT}/${BRANCH}/latest"
+
+
+
+if [[ -z "$BUILD" ]]; then
+  ROOTFS_URL="$(wget -q -O- ${S3_URL})" || (echo "ERROR: cannot reach ${S3_URL}" && exit 1)
+  if [[ -z "${ROOTFS_URL}" ]]; then
+    echo "error: could not get URL for latest build from ${S3_URL} - check internet connection"
+    exit 1
+  fi
+else
+  ROOTFS_URL="${S3_URL%latest}$BUILD"
+fi
+
+case "${WHAT}" in
+  "buildroot")
+    BR_BUILD="$(wget -q -O- ${ROOTFS_URL}/build)"
+    BUILD=${BR_BUILD}
+    ROOTFS_URL="${ROOTFS_URL}/images"
+    BR_URL="${ROOTFS_URL}"
+    ;;
+  "debian")
+    BR_BUILD="$(wget -q -O- ${ROOTFS_URL}/br_build)"
+    BR_URL="${BASE_URL}/buildroot/${BRANCH%-gui}/${BR_BUILD}/images"
+    BUILD="$(wget -q -O- ${ROOTFS_URL}/build)"
+    ;;
+  "pocketchip")
+    BR_BUILD=123
+    BUILD=123
+    ROOTFS_URL="http://opensource.nextthing.co/pocketchip"
+    BR_URL="$ROOTFS_URL"
+    ;;
+esac 
+
+echo "ROOTFS_URL=${ROOTFS_URL}"
+echo "BUILD=${BUILD}"
+echo "BR_URL=${BR_URL}"
+echo "BR_BUILD=${BR_BUILD}"
+
+require_directory "${FW_IMAGE_DIR}"
+cache_download "${FW_IMAGE_DIR}" ${ROOTFS_URL} rootfs.ubi
+cache_download "${FW_IMAGE_DIR}" ${BR_URL} sun5i-r8-chip.dtb
+cache_download "${FW_IMAGE_DIR}" ${BR_URL} sunxi-spl.bin
+cache_download "${FW_IMAGE_DIR}" ${BR_URL} sunxi-spl-with-ecc.bin
+cache_download "${FW_IMAGE_DIR}" ${BR_URL} uboot-env.bin
+cache_download "${FW_IMAGE_DIR}" ${BR_URL} zImage
+cache_download "${FW_IMAGE_DIR}" ${BR_URL} u-boot-dtb.bin
+
+BUILDROOT_OUTPUT_DIR="${FW_DIR}" ${FLASH_SCRIPT} ${FLASH_SCRIPT_OPTION} || echo "ERROR: could not flash" && exit 1
+
+#if ! wait_for_linuxboot; then
+#  echo "ERROR: could not flash"
+#  exit 1
+#else
+#  ${SCRIPTDIR}/verify.sh
+#fi
+
+exit $?
diff --git a/chip-update-firmware.sh b/chip-update-firmware.sh
index d6f2c64..f71b2d8 100755
--- a/chip-update-firmware.sh
+++ b/chip-update-firmware.sh
@@ -103,57 +103,39 @@ S3_URL="${BASE_URL}/${WHAT}/${BRANCH}/latest"
 
 
 
-if [[ -z "$BUILD" ]]; then
-  ROOTFS_URL="$(wget -q -O- ${S3_URL})" || (echo "ERROR: cannot reach ${S3_URL}" && exit 1)
-  if [[ -z "${ROOTFS_URL}" ]]; then
-    echo "error: could not get URL for latest build from ${S3_URL} - check internet connection"
-    exit 1
-  fi
+if [[ ! -z "$BUILD" ]]; then
+  case "${WHAT}" in
+    "buildroot")
+      if [[ "$BUILD" -lt "74" ]] && [[ "${BRANCH}" == "stable" ]]; then
+            ./chip-legacy-update.sh $@ || echo "ERROR: could not flash" && exit 1
+            exit 0
+      fi
+      if [[ "$BUILD" -lt "60" ]] && [[ "${BRANCH}" == "next" ]]; then
+            ./chip-legacy-update.sh $@ || echo "ERROR: could not flash" && exit 1
+            exit 0
+      fi
+    ;;
+    "debian")
+      if [[ "$BUILD" -lt "47" ]] && [[ "${BRANCH}" == "stable" ]]; then
+        ./chip-legacy-update.sh $@ || echo "ERROR: could not flash" && exit 1
+        exit 0
+      fi
+      if [[ "$BUILD" -lt "148" ]] && [[ "${BRANCH}" == "next" ]]; then
+        ./chip-legacy-update.sh $@ || echo "ERROR: could not flash" && exit 1
+        exit 0
+      fi
+      if [[ "$BUILD" -lt "4" ]] && [[ "${BRANCH}" == "stable-gui" ]]; then
+        ./chip-legacy-update.sh $@ || echo "ERROR: could not flash" && exit 1
+        exit 0
+      fi
+      if [[ "$BUILD" -lt "148" ]] && [[ "${BRANCH}" == "next-gui" ]]; then
+        ./chip-legacy-update.sh $@ || echo "ERROR: could not flash" && exit 1
+        exit 0
+      fi
+    ;;
+  esac
 else
   ROOTFS_URL="${S3_URL%latest}$BUILD"
 fi
 
-case "${WHAT}" in
-  "buildroot")
-    BR_BUILD="$(wget -q -O- ${ROOTFS_URL}/build)"
-    BUILD=${BR_BUILD}
-    ROOTFS_URL="${ROOTFS_URL}/images"
-    BR_URL="${ROOTFS_URL}"
-    ;;
-  "debian")
-    BR_BUILD="$(wget -q -O- ${ROOTFS_URL}/br_build)"
-    BR_URL="${BASE_URL}/buildroot/${BRANCH%-gui}/${BR_BUILD}/images"
-    BUILD="$(wget -q -O- ${ROOTFS_URL}/build)"
-    ;;
-  "pocketchip")
-    BR_BUILD=123
-    BUILD=123
-    ROOTFS_URL="http://opensource.nextthing.co/pocketchip"
-    BR_URL="$ROOTFS_URL"
-    ;;
-esac 
-
-echo "ROOTFS_URL=${ROOTFS_URL}"
-echo "BUILD=${BUILD}"
-echo "BR_URL=${BR_URL}"
-echo "BR_BUILD=${BR_BUILD}"
-
-require_directory "${FW_IMAGE_DIR}"
-cache_download "${FW_IMAGE_DIR}" ${ROOTFS_URL} rootfs.ubi
-cache_download "${FW_IMAGE_DIR}" ${BR_URL} sun5i-r8-chip.dtb
-cache_download "${FW_IMAGE_DIR}" ${BR_URL} sunxi-spl.bin
-cache_download "${FW_IMAGE_DIR}" ${BR_URL} sunxi-spl-with-ecc.bin
-cache_download "${FW_IMAGE_DIR}" ${BR_URL} uboot-env.bin
-cache_download "${FW_IMAGE_DIR}" ${BR_URL} zImage
-cache_download "${FW_IMAGE_DIR}" ${BR_URL} u-boot-dtb.bin
-
-BUILDROOT_OUTPUT_DIR="${FW_DIR}" ${FLASH_SCRIPT} ${FLASH_SCRIPT_OPTION} || echo "ERROR: could not flash" && exit 1
-
-#if ! wait_for_linuxboot; then
-#  echo "ERROR: could not flash"
-#  exit 1
-#else
-#  ${SCRIPTDIR}/verify.sh
-#fi
-
 exit $?