Add a requirement checkbox to encourage booting stock rom at least on…

…ce. (#316)

Resolves #307

openandroidinstaller/views/requirements_view.py

@@ -214,6 +214,10 @@ def build(self):
             self.checkboxes.append(battery_checkbox)
             self.checkbox_cards.append(battery_check_card)
 
+            boot_stock_checkbox, boot_stock_check_card = self.get_boot_stock_check()
+            self.checkboxes.append(boot_stock_checkbox)
+            self.checkbox_cards.append(boot_stock_check_card)
+
             lock_checkbox, lock_check_card = self.get_lock_check()
             self.checkboxes.append(lock_checkbox)
             self.checkbox_cards.append(lock_check_card)
@@ -251,6 +255,31 @@ def get_battery_check(self):
         )
         return battery_checkbox, battery_check_card
 
+    def get_boot_stock_check(self):
+        """Get checkbox and card for default requirements: boot stock once."""
+        boot_stock_checkbox = Checkbox(
+            label="Booted the stock OS at least once.",
+            on_change=self.enable_continue_button,
+        )
+        boot_stock_check_card = Card(
+            Container(
+                content=Column(
+                    [
+                        Markdown(
+                            """
+#### Boot your device with the stock OS at least once and check every functionality.
+Make sure that you can send and receive SMS and place and receive calls (also via WiFi and LTE, if available),
+otherwise it won\'t work on your custom ROM either! Additionally, some devices require that VoLTE/VoWiFi be utilized once on stock to provision IMS.
+            """
+                        ),
+                        boot_stock_checkbox,
+                    ]
+                ),
+                padding=10,
+            ),
+        )
+        return boot_stock_checkbox, boot_stock_check_card
+
     def get_lock_check(self):
         """Get the checkbox and card for the default requirement: disable lock code and fingerprint."""
         lock_checkbox = Checkbox(