add doc/check-lte-firmware-upgrade.md

doc/check-lte-firmware-upgrade.md

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+Notify on LTE firmware upgrade
+==============================
+
+[◀ Go back to main README](../README.md)
+
+Description
+-----------
+
+This script is run from scheduler periodically, checking for LTE firmware
+upgrades. Currently supported LTE hardware:
+
+* R11e-LTE
+* R11e-LTE-US
+* R11e-4G
+* R11e-LTE6
+
+Requirements and installation
+-----------------------------
+
+Just install the script:
+
+    $ScriptInstallUpdate check-lte-firmware-upgrade;
+
+... and create a scheduler:
+
+    / system scheduler add interval=1d name=check-lte-firmware-upgrade on-event="/ system script run check-lte-firmware-upgrade;" start-time=startup;
+
+Configuration
+-------------
+
+Notification setting are required for e-mail and telegram.
+
+See also
+--------
+
+* [Notify on RouterOS update](check-routeros-update.md)
+* [Install LTE firmware upgrade](unattended-lte-firmware-upgrade.md)
+
+---
+[◀ Go back to main README](../README.md)  
+[▲ Go back to top](#top)