diff --git a/scripts/pylib/twister/twisterlib/environment.py b/scripts/pylib/twister/twisterlib/environment.py
index daa691c..86770eb 100644
--- a/scripts/pylib/twister/twisterlib/environment.py
+++ b/scripts/pylib/twister/twisterlib/environment.py
@@ -178,6 +178,12 @@
                         when flash operation also executes test case on the platform.
                         """)
 
+    parser.add_argument("--flash-before", action="store_true", default=False,
+                        help="""Flash device before attaching to serial port.
+                        This is useful for devices that share the same port for programming
+                        and serial console, where flash must come first.
+                        """)
+
     test_or_build.add_argument(
         "-b", "--build-only", action="store_true", default="--prep-artifacts-for-testing" in sys.argv,
         help="Only build the code, do not attempt to run the code on targets.")
@@ -796,6 +802,14 @@
         logger.error("--device-flash-with-test requires --device_testing")
         sys.exit(1)
 
+    if options.flash_before and options.device_flash_with_test:
+        logger.error("--device-flash-with-test does not apply when --flash-before is used")
+        sys.exit(1)
+
+    if options.flash_before and options.device_serial_pty:
+        logger.error("--device-serial-pty cannot be used when --flash-before is set (for now)")
+        sys.exit(1)
+
     if options.shuffle_tests and options.subset is None:
         logger.error("--shuffle-tests requires --subset")
         sys.exit(1)
diff --git a/scripts/pylib/twister/twisterlib/handlers.py b/scripts/pylib/twister/twisterlib/handlers.py
index 8a732f2..ed0ee90 100755
--- a/scripts/pylib/twister/twisterlib/handlers.py
+++ b/scripts/pylib/twister/twisterlib/handlers.py
@@ -378,6 +378,10 @@
             # from the test.
             harness.capture_coverage = True
 
+        # Wait for serial connection
+        while not ser.isOpen():
+            time.sleep(0.1)
+
         # Clear serial leftover.
         ser.reset_input_buffer()
 
@@ -647,9 +651,13 @@
         if hardware.flash_with_test:
             flash_timeout += self.get_test_timeout()
 
+        serial_port = None
+        if hardware.flash_before is False:
+            serial_port = serial_device
+
         try:
             ser = self._create_serial_connection(
-                serial_device,
+                serial_port,
                 hardware.baud,
                 flash_timeout,
                 serial_pty,
@@ -703,6 +711,15 @@
         if post_flash_script:
             self.run_custom_script(post_flash_script, 30)
 
+        # Connect to device after flashing it
+        if hardware.flash_before:
+            try:
+                logger.debug(f"Attach serial device {serial_device} @ {hardware.baud} baud")
+                ser.port = serial_device
+                ser.open()
+            except serial.SerialException:
+                return
+
         if not flash_error:
             # Always wait at most the test timeout here after flashing.
             t.join(self.get_test_timeout())
diff --git a/scripts/pylib/twister/twisterlib/hardwaremap.py b/scripts/pylib/twister/twisterlib/hardwaremap.py
index 27bca00..2ef780c 100644
--- a/scripts/pylib/twister/twisterlib/hardwaremap.py
+++ b/scripts/pylib/twister/twisterlib/hardwaremap.py
@@ -49,7 +49,8 @@
                  post_flash_script=None,
                  runner=None,
                  flash_timeout=60,
-                 flash_with_test=False):
+                 flash_with_test=False,
+                 flash_before=False):
 
         self.serial = serial
         self.baud = serial_baud or 115200
@@ -63,6 +64,7 @@
         self.product = product
         self.runner = runner
         self.runner_params = runner_params
+        self.flash_before = flash_before
         self.fixtures = []
         self.post_flash_script = post_flash_script
         self.post_script = post_script
@@ -177,7 +179,8 @@
                                 False,
                                 baud=self.options.device_serial_baud,
                                 flash_timeout=self.options.device_flash_timeout,
-                                flash_with_test=self.options.device_flash_with_test
+                                flash_with_test=self.options.device_flash_with_test,
+                                flash_before=self.options.flash_before,
                                 )
 
             elif self.options.device_serial_pty:
@@ -186,7 +189,8 @@
                                 self.options.pre_script,
                                 True,
                                 flash_timeout=self.options.device_flash_timeout,
-                                flash_with_test=self.options.device_flash_with_test
+                                flash_with_test=self.options.device_flash_with_test,
+                                flash_before=False,
                                 )
 
             # the fixtures given by twister command explicitly should be assigned to each DUT
@@ -207,9 +211,9 @@
         print(tabulate(table, headers=header, tablefmt="github"))
 
 
-    def add_device(self, serial, platform, pre_script, is_pty, baud=None, flash_timeout=60, flash_with_test=False):
+    def add_device(self, serial, platform, pre_script, is_pty, baud=None, flash_timeout=60, flash_with_test=False, flash_before=False):
         device = DUT(platform=platform, connected=True, pre_script=pre_script, serial_baud=baud,
-                     flash_timeout=flash_timeout, flash_with_test=flash_with_test
+                     flash_timeout=flash_timeout, flash_with_test=flash_with_test, flash_before=flash_before
                     )
         if is_pty:
             device.serial_pty = serial
@@ -229,6 +233,9 @@
             flash_with_test = dut.get('flash_with_test')
             if flash_with_test is None:
                 flash_with_test = self.options.device_flash_with_test
+            flash_before = dut.get('flash_before')
+            if flash_before is None:
+                flash_before = self.options.flash_before and (not (flash_with_test or serial_pty))
             platform  = dut.get('platform')
             id = dut.get('id')
             runner = dut.get('runner')
@@ -251,6 +258,7 @@
                           serial_baud=baud,
                           connected=connected,
                           pre_script=pre_script,
+                          flash_before=flash_before,
                           post_script=post_script,
                           post_flash_script=post_flash_script,
                           flash_timeout=flash_timeout,
diff --git a/scripts/schemas/twister/hwmap-schema.yaml b/scripts/schemas/twister/hwmap-schema.yaml
index 3ecb064..1865462 100644
--- a/scripts/schemas/twister/hwmap-schema.yaml
+++ b/scripts/schemas/twister/hwmap-schema.yaml
@@ -61,3 +61,6 @@
       "flash_with_test":
         type: bool
         required: false
+      "flash_before":
+        type: bool
+        required: false