diff --git a/howtos.rst b/howtos.rst
index e9924dcb..20053cc9 100644
--- a/howtos.rst
+++ b/howtos.rst
@@ -7,6 +7,7 @@ How-tos & Guides
 
    howtos/tailscale_install
    howtos/stable_kernel_backport
+   howtos/about_appliance_id
    howtos/15-2_to_15-3
    howtos/15-3_to_15-4
    howtos/15-4_to_15-5
diff --git a/howtos/about_appliance_id.rst b/howtos/about_appliance_id.rst
new file mode 100644
index 00000000..c9f0952a
--- /dev/null
+++ b/howtos/about_appliance_id.rst
@@ -0,0 +1,90 @@
+.. _aboutapplianceid:
+
+About Appliance ID
+==================
+
+During the initial :ref:`webui_setup` stage of a Rockstor install,
+an **Appliance ID** is automatically generated.
+This ID, intended as a Universal Unique Identifier (UUID),
+is an exact copy of the host system's, read motherboard's, response to:
+
+.. code-block:: console
+
+    cat /sys/class/dmi/id/product_uuid
+
+.. note::
+
+    With the majority of systems,
+    this is a genuinely unique reference; and no intervention of any sort is required.
+
+The implied uniqueness is assumed by multiple current Rockstor subsystems, e.g.
+when :ref:`add_appliance` as part of setting up a Share :ref:`sharereplication`.
+And as part of configuring a system to use the :ref:`stable_channel` updates.
+
+.. warning::
+
+    WARNING: some systems, via lax firmware implementations, return a NON-Unique/fake product_uuid.
+
+.. _knownfakeapplianceids:
+
+Fake Appliance ID examples
+--------------------------
+
+The following are examples on non-unique Appliance IDs,
+all recognised by the latest version of Rockstor.
+
+- **03000200-0400-0500-0006-000700080009** -
+  ASRock N3700-ITX, ASRock C2550D4I - Rockstor devs.
+  ASRock J3455 ITX - Thanks to forum member adworacz.
+- **00020003-0004-0005-0006-000700080009** -
+  ZOTAC 880G-ITX (880GITX-A-E) - Thanks to forum member mmmdonuts.
+- **5c4606fa-192f-453a-b299-7b088c63bb9b** -
+  GIADA N70E-DR - Thanks to forum member hammerite.
+- **31393138-3538-5a43-3135-353130323750** -
+  HP/HPE ProLiant MicroServer Gen8 - Thanks to David via support email.
+- **00000000-0000-0000-0807-060504030201** -
+  Reported by Appman
+- **00000000-2093bfe3-e53b-4fc3-9cb1-9217ea6228c7** -
+  Reported by Appman
+
+For all non-unique Appliance IDs known to the bundled version of Rockstor within an installer,
+a fail-over Appliance ID is substituted automatically.
+This has the advantage of ensuring that Rockstor's Appliance ID dependant subsystems are functional.
+But the disadvantage is that upon re-install, using the same motherboard,
+a new Appliance ID will be generated.
+
+.. note::
+
+    `Appman <https://appman.rockstor.com/>`_
+    a complementary service for Stable Updates subscription members,
+    has the facility to trivially, and with immediate effect,
+    transfer an active Stable Updates subscription *activation code* via an Appliance ID edit function.
+    But far better that this is not required.
+    Hence our initial use of hardware-static Appliance IDs.
+
+.. _setapplianceid:
+
+Set Appliance ID
+----------------
+
+For whatever reason,
+mostly notably if you have a non-unique Appliance ID that is not known to Rockstor,
+the following procedure can assert an Appliance ID of your choice:
+
+1. Generate a genuinely unique UUID, e.g. from `Online UUID Generator <https://www.uuidgenerator.net>`_.
+
+2. Via a local console, as the `root` user, substitute your generated UUID in the following:
+
+(i.e. replace your-generated-appliance-id-here with the Generated UUID).
+
+.. code-block:: console
+
+  psql -U rocky storageadmin
+  UPDATE storageadmin_appliance SET uuid='your-generated-appliance-id-here' WHERE current_appliance=True;
+  \q
+  exit
+
+The above will expect entry of the password 'rocky'. Our DB is configured, as per upstream defaults,
+To only be accessible via the local host: hence the local console requirement.
+
+Confirm your new Appliance ID by visiting/refreshing the System -> Appliances Web-UI page.