diff --git a/src/entryPoints/HttpRoutes.cpp b/src/entryPoints/HttpRoutes.cpp
index bac969e..14f1bac 100644
--- a/src/entryPoints/HttpRoutes.cpp
+++ b/src/entryPoints/HttpRoutes.cpp
@@ -118,6 +118,13 @@ void registerHttpRoutes(AsyncWebServer &server) {
           ESP_LOGD(TAG, "No restore options sent.  Using defaults...");
           opts.shades = true;
         }
+        // Otherwise the device would reboot having restored nothing.
+        const uint8_t parts = restoreParts(opts);
+        if(parts == 0) {
+          LittleFS.remove("/shades.tmp");
+          request->send(400, _encoding_json, F("{\"status\":\"ERROR\",\"desc\":\"No part of the backup was chosen, so nothing was restored.\"}"));
+          return;
+        }
         // Checked here so the client hears about a bad file.  It only reads
         // the file; the shades are still changed on loop() alone.
         if(!ShadeConfigFile::validateFile("/shades.tmp")) {
@@ -129,7 +136,7 @@ void registerHttpRoutes(AsyncWebServer &server) {
         // codes, and then reboots.
         loop_item_t item;
         item.type = loop_item_type_t::restore_shades;
-        item.restoreParts = restoreParts(opts);
+        item.restoreParts = parts;
         if(!queueLoopItem(request, item)) return;
         request->send(200, _encoding_json, "{\"status\":\"Success\",\"desc\":\"Restoring Shade settings\"}");
       }
diff --git a/test/e2e/test_restore.py b/test/e2e/test_restore.py
index e4b1e25..96593b7 100644
--- a/test/e2e/test_restore.py
+++ b/test/e2e/test_restore.py
@@ -28,6 +28,14 @@ def test_restore_reads_the_options_sent_as_a_form_field(host, token):
     assert json.loads(body)["desc"] == "JSON parse error"
 
 
+def test_a_restore_with_no_part_chosen_is_refused(host, token):
+    """Checked before the file, so this file, which isn't a backup, restores nothing either way."""
+    options = json.dumps({"shades": False})
+    status, _, body = upload(host, "/restore", auth(token), fields={"data": options})
+    assert status == 400, body
+    assert json.loads(body)["desc"] == "No part of the backup was chosen, so nothing was restored."
+
+
 def test_a_refused_restore_leaves_no_upload_behind(host, token):
     """A later /restore without a file must not find the refused one's upload."""
     status, _, _ = upload(host, "/restore", auth(token), fields={"data": "{"})