diff --git a/openwrt/teltonika-firmware-upgrade.sh b/openwrt/teltonika-firmware-upgrade.sh
new file mode 100644
index 0000000..2d8b3e7
--- /dev/null
+++ b/openwrt/teltonika-firmware-upgrade.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+# Nico Schottelius, 2022-01-26
+
+if [ $# -ne 1 ]; then
+    echo "$0 address"
+    echo "    address: connect to this address (often: 192.168.1.1)"
+    exit 1
+fi
+
+set -x
+
+filename=RUT2_R_00.07.01.2_WEBUI.bin
+device_ip=$1; shift
+
+while ! ping -c1 ${device_ip}; do
+    echo "Cannot ping $device_ip yet - waiting"
+    sleep 1
+done
+
+if echo $device_ip | grep -q :; then
+    scp_ip="[$device_ip]"
+else
+    scp_ip="$device_ip"
+fi
+
+wget -c https://wiki.teltonika-networks.com/wikibase/images/8/85/${filename}
+
+scp ${filename} root@${scp_ip}:/tmp
+ssh root@${device_ip} "sysupgrade -n /tmp/*.bin"