diff --git a/ereuse_devicehub/inventory/forms.py b/ereuse_devicehub/inventory/forms.py
index 7f51bebf..655bffec 100644
--- a/ereuse_devicehub/inventory/forms.py
+++ b/ereuse_devicehub/inventory/forms.py
@@ -1692,3 +1692,81 @@ class BindingForm(FlaskForm):
             return False
 
         return True
+
+
+class UserTrustsForm(FlaskForm):
+    snapshot_type = SelectField(
+        '',
+        [validators.DataRequired()],
+        choices=[("new_device", "New Device"), ("update", "Update")],
+        default="new_device",
+        render_kw={'class': "form-select"},
+    )
+
+    def __init__(self, snapshot_uuid, *args, **kwargs):
+        self.snapshot = Snapshot.query.filter_by(uuid=snapshot_uuid).first()
+        self.device = self.snapshot.device if self.snapshot.device else None
+        self.snapshot_type.kwargs['default'] = self.snapshot.get_new_device()
+        super().__init__(*args, **kwargs)
+
+    def validate(self, extra_validators=None):
+        is_valid = super().validate(extra_validators)
+
+        if not is_valid:
+            txt = ""
+            self.snapthot_type.errors = [txt]
+            return False
+
+        return True
+
+    def unic(self):
+        try:
+            return self._unic
+        except Exception:
+            self._unic = (
+                Device.query.filter_by(
+                    hid=self.device.hid, owner=g.user, placeholder=None
+                ).count()
+                < 2
+            )
+
+            return self._unic
+
+    def show(self):
+        if not self.snapshot or not self.device:
+            return False
+
+        if not hasattr(self.device, 'system_uuid'):
+            return False
+
+        if not self.device.system_uuid:
+            return False
+
+        if self.snapshot.get_new_device() == 'update':
+            # To do Split
+            return True
+
+        if not self.unic():
+            # To do merge
+            return True
+
+        return False
+
+    def save(self, commit=True):
+        # import pdb; pdb.set_trace()
+        if not self.show():
+            return
+
+        if self.snapshot_type.data == self.snapshot.get_new_device():
+            return
+
+        if self.snapshot_type.data == 'update' and not self.unic():
+            self.device.merge()
+
+        if self.snapshot_type.data == 'new_device' and self.unic():
+            self.device.split()
+
+        if commit:
+            db.session.commit()
+
+        return self.snapshot
diff --git a/ereuse_devicehub/inventory/views.py b/ereuse_devicehub/inventory/views.py
index ed3939be..15988ddb 100644
--- a/ereuse_devicehub/inventory/views.py
+++ b/ereuse_devicehub/inventory/views.py
@@ -33,6 +33,7 @@ from ereuse_devicehub.inventory.forms import (
     TransferForm,
     UploadPlaceholderForm,
     UploadSnapshotForm,
+    UserTrustsForm,
 )
 from ereuse_devicehub.labels.forms import PrintLabelsForm
 from ereuse_devicehub.parser.models import PlaceholdersLog, SnapshotsLog
@@ -1228,9 +1229,12 @@ class SnapshotListView(GenericMixin):
 
 class SnapshotDetailView(GenericMixin):
     template_name = 'inventory/snapshot_detail.html'
+    methods = ['GET', 'POST']
+    form_class = UserTrustsForm
 
     def dispatch_request(self, snapshot_uuid):
         self.snapshot_uuid = snapshot_uuid
+        form = self.form_class(snapshot_uuid)
         self.get_context()
         self.context['page_title'] = "Snapshot Detail"
         self.context['snapshots_log'] = self.get_snapshots_log()
@@ -1238,6 +1242,10 @@ class SnapshotDetailView(GenericMixin):
         self.context['snapshot_sid'] = ''
         if self.context['snapshots_log'].count():
             self.context['snapshot_sid'] = self.context['snapshots_log'][0].sid
+        self.context['form'] = form
+
+        if form.validate_on_submit():
+            form.save()
 
         return flask.render_template(self.template_name, **self.context)
 
diff --git a/ereuse_devicehub/resources/action/models.py b/ereuse_devicehub/resources/action/models.py
index 6060e037..7454cac4 100644
--- a/ereuse_devicehub/resources/action/models.py
+++ b/ereuse_devicehub/resources/action/models.py
@@ -701,6 +701,19 @@ class Snapshot(JoinedWithOneDeviceMixin, ActionWithOneDevice):
 
         return hdds
 
+    def get_new_device(self):
+
+        if not self.device:
+            return ''
+
+        snapshots = []
+        for s in self.device.actions:
+            if s == self:
+                break
+            if s.type == self.type:
+                snapshots.append(s)
+        return snapshots and 'update' or 'new_device'
+
     def __str__(self) -> str:
         return '{}. {} version {}.'.format(self.severity, self.software, self.version)
 
diff --git a/ereuse_devicehub/resources/device/models.py b/ereuse_devicehub/resources/device/models.py
index 39677597..54d1fa98 100644
--- a/ereuse_devicehub/resources/device/models.py
+++ b/ereuse_devicehub/resources/device/models.py
@@ -875,6 +875,14 @@ class Device(Thing):
         }
         return types.get(self.type, '')
 
+    def split(self):
+        self.user_trusts = False
+        return
+
+    def merge(self):
+        self.user_trusts = True
+        return
+
     def __lt__(self, other):
         return self.id < other.id
 
diff --git a/ereuse_devicehub/templates/inventory/snapshot_detail.html b/ereuse_devicehub/templates/inventory/snapshot_detail.html
index 4ea87572..b084f76b 100644
--- a/ereuse_devicehub/templates/inventory/snapshot_detail.html
+++ b/ereuse_devicehub/templates/inventory/snapshot_detail.html
@@ -20,9 +20,44 @@
         <div class="card-body pt-3">
           <h3>{{ snapshot_sid }} | {{ snapshot_uuid }}</h3>
           <!-- Bordered Tabs -->
+          {% if form.show() %}
+          <ul class="nav nav-tabs nav-tabs-bordered">
+
+            <li class="nav-item">
+              <button class="nav-link active" data-bs-toggle="tab" data-bs-target="#log">Log</button>
+            </li>
+
+            <li class="nav-item">
+              <button class="nav-link" data-bs-toggle="tab" data-bs-target="#change-type">Change type updated</button>
+            </li>
+
+          </ul>
+          {% endif %}
           <div class="tab-content pt-2">
 
-            <div class="tab-pane fade show active">
+            {% if form.show() %}
+            <div class="tab-pane fade" id="change-type">
+              <h5 class="card-title">Change Snapshot Type Upload</h5>
+              <div class="list-group col-6">
+                <div class="list-group-item">
+                  <form method="post" class="row g-3 needs-validation">
+                    {{ form.csrf_token }}
+                    {% for f in form %}
+                      {% if f != form.csrf_token %}
+                      <p class="mb-1">
+                        {{ f }}
+                      </p>
+                      {% endif %}
+                    {% endfor %}
+                      <p class="mb-1">
+                        <button class="btn btn-primary" type="submit">Save</button>
+                      </p>
+                  </form>
+                </div>
+              </div>
+            </div>
+            {% endif %}
+            <div class="tab-pane fade show active" id="log">
               <h5 class="card-title">Traceability log Details</h5>
               <div class="list-group col-6">
                 {% for log in snapshots_log %}