diff --git a/unattended-lte-firmware-upgrade b/unattended-lte-firmware-upgrade
index 087e32d..fafda62 100644
--- a/unattended-lte-firmware-upgrade
+++ b/unattended-lte-firmware-upgrade
@@ -26,7 +26,7 @@
         /system/scheduler/remove ($1 . "-firmware-upgrade");
         /interface/lte/firmware-upgrade $1 upgrade=yes;
         :log info ("LTE firmware upgrade on '" . $1 . "' finished, waiting for reset.");
-        :delay 150s;
+        :delay 240s;
         :local Firmware [ /interface/lte/firmware-upgrade $1 once as-value ];
         :if (($Firmware->"installed") != ($Firmware->"latest")) do={
           :log warning ("LTE firmware versions still differ. Resetting again...");