diff --git a/doc/api/resources/checkinlists.rst b/doc/api/resources/checkinlists.rst
index 724e0214a2..a96713a73b 100644
--- a/doc/api/resources/checkinlists.rst
+++ b/doc/api/resources/checkinlists.rst
@@ -618,8 +618,9 @@ Order position endpoints
    :<json boolean canceled_supported: When this parameter is set to ``true``, the response code ``canceled`` may be
                                       returned. Otherwise, canceled orders will return ``unpaid``.
    :<json datetime datetime: Specifies the datetime of the check-in. If not supplied, the current time will be used.
-   :<json boolean force: Specifies that the check-in should succeed regardless of previous check-ins or required
-                         questions that have not been filled. Defaults to ``false``.
+   :<json boolean force: Specifies that the check-in should succeed regardless of revoked barcode, previous check-ins or required
+                         questions that have not been filled. This is usually used to upload offline scans that already happened,
+                         because there's no point in validating them since they happend whether they are valid or not. Defaults to ``false``.
    :<json string type: Send ``"exit"`` for an exit and ``"entry"`` (default) for an entry.
    :<json boolean ignore_unpaid: Specifies that the check-in should succeed even if the order is in pending state.
                                  Defaults to ``false`` and only works when ``include_pending`` is set on the check-in
diff --git a/src/pretix/api/views/checkin.py b/src/pretix/api/views/checkin.py
index bde2cc4756..15a1eb71af 100644
--- a/src/pretix/api/views/checkin.py
+++ b/src/pretix/api/views/checkin.py
@@ -32,6 +32,7 @@ from django.utils.functional import cached_property
 from django.utils.timezone import now
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from django_scopes import scopes_disabled
+from packaging.version import parse
 from rest_framework import viewsets
 from rest_framework.decorators import action
 from rest_framework.fields import DateTimeField
@@ -421,6 +422,7 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
             nonce=nonce,
             forced=force,
         )
+        raw_barcode_for_checkin = None
 
         try:
             queryset = self.get_queryset(ignore_status=True, ignore_products=True)
@@ -455,7 +457,41 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
                     error_reason=Checkin.REASON_INVALID,
                     **common_checkin_args,
                 )
-                raise Http404()
+
+                if force and isinstance(self.request.auth, Device):
+                    # There was a bug in libpretixsync: If you scanned a ticket in offline mode that was
+                    # valid at the time but no longer exists at time of upload, the device would retry to
+                    # upload the same scan over and over again. Since we can't update all devices quickly,
+                    # here's a dirty workaround to make it stop.
+                    try:
+                        brand = self.request.auth.software_brand
+                        ver = parse(self.request.auth.software_version)
+                        legacy_mode = (
+                            (brand == 'pretixSCANPROXY' and ver < parse('0.0.3')) or
+                            (brand == 'pretixSCAN Android' and ver < parse('1.11.2')) or
+                            (brand == 'pretixSCAN' and ver < parse('1.11.2'))
+                        )
+                        if legacy_mode:
+                            return Response({
+                                'status': 'error',
+                                'reason': Checkin.REASON_ALREADY_REDEEMED,
+                                'reason_explanation': None,
+                                'require_attention': False,
+                                '__warning': 'Compatibility hack active due to detected old pretixSCAN version',
+                            }, status=400)
+                    except:  # we don't care e.g. about invalid version numbers
+                        pass
+
+                return Response({
+                    'detail': 'Not found.',  # for backwards compatibility
+                    'status': 'error',
+                    'reason': Checkin.REASON_INVALID,
+                    'reason_explanation': None,
+                    'require_attention': False,
+                }, status=404)
+            elif revoked_matches and force:
+                op = revoked_matches[0].position
+                raw_barcode_for_checkin = self.kwargs['pk']
             else:
                 op = revoked_matches[0].position
                 op.order.log_action('pretix.event.checkin.revoked', data={
@@ -506,7 +542,8 @@ class CheckinListPositionViewSet(viewsets.ReadOnlyModelViewSet):
                     user=self.request.user,
                     auth=self.request.auth,
                     type=type,
-                    raw_barcode=None,
+                    raw_barcode=raw_barcode_for_checkin,
+                    from_revoked_secret=True,
                 )
             except RequiredQuestionsError as e:
                 return Response({
diff --git a/src/pretix/base/services/checkin.py b/src/pretix/base/services/checkin.py
index 0902ff9791..92582cd85f 100644
--- a/src/pretix/base/services/checkin.py
+++ b/src/pretix/base/services/checkin.py
@@ -567,7 +567,7 @@ def _save_answers(op, answers, given_answers):
 def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict, force=False,
                     ignore_unpaid=False, nonce=None, datetime=None, questions_supported=True,
                     user=None, auth=None, canceled_supported=False, type=Checkin.TYPE_ENTRY,
-                    raw_barcode=None):
+                    raw_barcode=None, from_revoked_secret=False):
     """
     Create a checkin for this particular order position and check-in list. Fails with CheckInError if the check in is
     not valid at this time.
@@ -669,7 +669,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
                 device=device,
                 gate=device.gate if device else None,
                 nonce=nonce,
-                forced=force and not entry_allowed,
+                forced=force and (not entry_allowed or from_revoked_secret),
                 raw_barcode=raw_barcode,
             )
             op.order.log_action('pretix.event.checkin', data={
diff --git a/src/pretix/base/services/seating.py b/src/pretix/base/services/seating.py
index 7e3aaee432..d2bae73f64 100644
--- a/src/pretix/base/services/seating.py
+++ b/src/pretix/base/services/seating.py
@@ -45,7 +45,7 @@ def validate_plan_change(event, subevent, plan):
                 seat=OuterRef('pk'),
                 canceled=False,
             ).exclude(
-                order__status=Order.STATUS_CANCELED
+                order__status=(Order.STATUS_CANCELED, Order.STATUS_EXPIRED)
             ))
         ).annotate(has_v=Count('vouchers')).filter(
             subevent=subevent,
diff --git a/src/tests/api/test_checkin.py b/src/tests/api/test_checkin.py
index aaaae3587e..65702d04d5 100644
--- a/src/tests/api/test_checkin.py
+++ b/src/tests/api/test_checkin.py
@@ -1106,3 +1106,81 @@ def test_store_failed(token_client, organizer, clist, event, order):
         'error_reason': 'unknown'
     }, format='json')
     assert resp.status_code == 400
+
+
+@pytest.mark.django_db
+def test_redeem_unknown(token_client, organizer, clist, event, order):
+    resp = token_client.post('/api/v1/organizers/{}/events/{}/checkinlists/{}/positions/{}/redeem/'.format(
+        organizer.slug, event.slug, clist.pk, 'unknown_secret'
+    ), {
+        'force': True
+    }, format='json')
+    assert resp.status_code == 404
+    assert resp.data["status"] == "error"
+    assert resp.data["reason"] == "invalid"
+    with scopes_disabled():
+        assert not Checkin.objects.last()
+
+
+@pytest.mark.django_db
+def test_redeem_unknown_revoked(token_client, organizer, clist, event, order):
+    with scopes_disabled():
+        p = order.positions.first()
+        event.revoked_secrets.create(position=p, secret='revoked_secret')
+    resp = token_client.post('/api/v1/organizers/{}/events/{}/checkinlists/{}/positions/{}/redeem/'.format(
+        organizer.slug, event.slug, clist.pk, 'revoked_secret'
+    ), {
+    }, format='json')
+    assert resp.status_code == 400
+    assert resp.data["status"] == "error"
+    assert resp.data["reason"] == "revoked"
+    with scopes_disabled():
+        assert not Checkin.objects.last()
+
+
+@pytest.mark.django_db
+def test_redeem_unknown_revoked_force(token_client, organizer, clist, event, order):
+    with scopes_disabled():
+        p = order.positions.first()
+        event.revoked_secrets.create(position=p, secret='revoked_secret')
+    resp = token_client.post('/api/v1/organizers/{}/events/{}/checkinlists/{}/positions/{}/redeem/'.format(
+        organizer.slug, event.slug, clist.pk, 'revoked_secret'
+    ), {
+        'force': True
+    }, format='json')
+    assert resp.status_code == 201
+    assert resp.data["status"] == "ok"
+    with scopes_disabled():
+        assert Checkin.objects.last().forced
+
+
+@pytest.mark.django_db
+def test_redeem_unknown_legacy_device_bug(device, device_client, organizer, clist, event, order):
+    device.software_brand = "pretixSCAN"
+    device.software_version = "1.11.1"
+    device.save()
+    resp = device_client.post('/api/v1/organizers/{}/events/{}/checkinlists/{}/positions/{}/redeem/'.format(
+        organizer.slug, event.slug, clist.pk, 'unknown_secret'
+    ), {
+        'force': True
+    }, format='json')
+    print(resp.data)
+    assert resp.status_code == 400
+    assert resp.data["status"] == "error"
+    assert resp.data["reason"] == "already_redeemed"
+    with scopes_disabled():
+        assert not Checkin.objects.last()
+
+    device.software_brand = "pretixSCAN"
+    device.software_version = "1.11.2"
+    device.save()
+    resp = device_client.post('/api/v1/organizers/{}/events/{}/checkinlists/{}/positions/{}/redeem/'.format(
+        organizer.slug, event.slug, clist.pk, 'unknown_secret'
+    ), {
+        'force': True
+    }, format='json')
+    assert resp.status_code == 404
+    assert resp.data["status"] == "error"
+    assert resp.data["reason"] == "invalid"
+    with scopes_disabled():
+        assert not Checkin.objects.last()