diff --git a/scripts/ios-install-third-party.sh b/scripts/ios-install-third-party.sh
index 271a3534811..0d698ea3de1 100755
--- a/scripts/ios-install-third-party.sh
+++ b/scripts/ios-install-third-party.sh
@@ -1,28 +1,56 @@
 #!/bin/bash
 
-set -e
-
 cachedir="$HOME/.rncache"
 mkdir -p "$cachedir"
 
+function file_fail () {
+    cachefile=$1
+    msg=$2
+
+    echo "$msg.  Debug info:" 2>&1
+    ls -l "$cachefile" 2>&1
+    shasum "$cachefile" 2>&1
+    exit 1
+}
+
 function fetch_and_unpack () {
     file=$1
     url=$2
-    cmd=$3
+    hash=$3
+    cmd=$4
 
-    if [ ! -f "$cachedir/$file" ]; then
+    retries=4
+    fetched=no
+
+    while true; do
+        if [ -f "$cachedir/$file" ]; then
+           if shasum -p "$cachedir/$file" |
+              awk -v hash="$hash" '{exit $1 != hash}'; then
+               break
+           else
+               echo "Incorrect hash:" 2>&1
+               shasum -p "$cachedir/$file" 2>&1
+               echo "Retrying..." 2>&1
+           fi
+        fi
+
+        (( retries = retries - 1 ))
+        if (( retries < 0 )); then
+            file_fail "$cachedir/$file" "Failed to successfully download '$file'"
+        fi
+
+        rm -f "$cachedir/$file"
         (cd "$cachedir"; curl -J -L -O "$url")
-    fi
+        fetched=yes
+    done
 
     dir=$(basename "$file" .tar.gz)
-    if [ ! -d "third-party/$dir" ]; then
+    if [ "$fetched" = "yes" ] || [ ! -d "third-party/$dir" ]; then
         (cd third-party;
+         rm -rf "$dir"
          echo Unpacking "$cachedir/$file"...
          if ! tar zxf "$cachedir/$file"; then
-             echo "Unpacking '$cachedir/$file' failed.  Debug info:" 2>&1
-             ls -l "$cachedir/$file" 2>&1
-             shasum ~/.rncache/boost_1_63_0.tar.gz 2>&1
-             exit 1
+             file_fail "$cachedir/$file" "Unpacking '$cachedir/$file' failed"
          fi
          cd "$dir"
          eval "${cmd:-true}")
@@ -33,7 +61,7 @@ mkdir -p third-party
 
 SCRIPTDIR=$(dirname "$0")
 
-fetch_and_unpack glog-0.3.4.tar.gz https://github.com/google/glog/archive/v0.3.4.tar.gz "\"$SCRIPTDIR/ios-configure-glog.sh\""
-fetch_and_unpack double-conversion-1.1.5.tar.gz https://github.com/google/double-conversion/archive/v1.1.5.tar.gz
-fetch_and_unpack boost_1_63_0.tar.gz https://github.com/react-native-community/boost-for-react-native/releases/download/v1.63.0-0/boost_1_63_0.tar.gz
-fetch_and_unpack folly-2016.09.26.00.tar.gz https://github.com/facebook/folly/archive/v2016.09.26.00.tar.gz
+fetch_and_unpack glog-0.3.4.tar.gz https://github.com/google/glog/archive/v0.3.4.tar.gz 69f91cd5a1de35ead0bc4103ea87294b0206a456 "\"$SCRIPTDIR/ios-configure-glog.sh\""
+fetch_and_unpack double-conversion-1.1.5.tar.gz https://github.com/google/double-conversion/archive/v1.1.5.tar.gz 96a8aba1b4ce7d4a7a3c123be26c379c2fed1def
+fetch_and_unpack boost_1_63_0.tar.gz https://github.com/react-native-community/boost-for-react-native/releases/download/v1.63.0-0/boost_1_63_0.tar.gz c3f57e1d22a995e608983effbb752b54b6eab741
+fetch_and_unpack folly-2016.09.26.00.tar.gz https://github.com/facebook/folly/archive/v2016.09.26.00.tar.gz f3b928b5039235bad6cece638c597c6684d1e4e6