diff --git a/pytest-embedded-idf/pytest_embedded_idf/serial.py b/pytest-embedded-idf/pytest_embedded_idf/serial.py
index d4e15ca4..e4d47116 100644
--- a/pytest-embedded-idf/pytest_embedded_idf/serial.py
+++ b/pytest-embedded-idf/pytest_embedded_idf/serial.py
@@ -3,7 +3,6 @@
 import json
 import logging
 import os
-import tempfile
 from typing import Optional, TextIO, Union
 
 import esptool
@@ -121,71 +120,35 @@ def flash(self) -> None:
             logging.error('No flash settings detected. Skipping auto flash...')
             return
 
-        addition_kwargs = self.app.flash_args.get('extra_esptool_args', {}).copy()
-        addition_kwargs['no-stub'] = not addition_kwargs.pop('stub')
-
-        write_flash_args = {
-            'erase-all': False,
-            'no-progress': False,
-            'verify': False,
-            'encrypt': False,
-            'encrypt-files': False,
-            'ignore-flash-encryption-efuse-setting': False,
-            'force': False,
-            'compress': True,
-            'no-compress': False,
-        }
-
-        for k, v in list(addition_kwargs.items()):
-            rk = k.replace('_', '-')
-            if rk in write_flash_args:
-                write_flash_args[rk] = addition_kwargs.pop(k)
-
-        _args = []
-
-        def _kwargs_extend_list(_items):
-            for _k, _v in _items:
-                if not _v:
-                    continue
-                _args.append(f'--{_k}')
-
-                if isinstance(_v, bool):
-                    continue
-                if isinstance(_v, list):
-                    _args.extend(_v)
-                    continue
-                _args.append(_v.strip())
-
         current_wk = os.getcwd()
         os.chdir(self.app.binary_path)
 
-        _kwargs_extend_list(addition_kwargs.items())
-        if os.path.isfile('flash_args'):
-            _args.extend(['write_flash', '@flash_args'])
-        else:
-            if os.path.isfile('flasher_args.json'):
-                flash_data = json.load(open('flasher_args.json'))
-                _args.append('write_flash')
-                for item in flash_data['flash_files'].items():
-                    _args.extend(item)
-                _args.extend(flash_data['write_flash_args'])
-
         if self.erase_nvs:
             address = self.app.partition_table['nvs']['offset']
             size = self.app.partition_table['nvs']['size']
-            nvs_file = tempfile.NamedTemporaryFile(delete=False)
-            nvs_file.write(b'\xff' * size)
-            if not isinstance(address, int):
-                address = int(address, 0)
-            ind = _args.index('write_flash')
-            _args.insert(ind + 1, address)
-            _args.insert(ind + 2, nvs_file.name)
+            esptool.main(['erase_region', str(address), str(size)], esp=self.esp)
 
-        _kwargs_extend_list(write_flash_args.items())
+        data = json.load(open('flasher_args.json'))
+        _args = []
+        for k, v in data['extra_esptool_args'].items():
+            if type(v, bool):
+                if k == 'stub':
+                    if v is False:
+                        _args.append('--no-stub')
+                else:
+                    if v:
+                        _args.append(f'--{k}')
+            else:
+                _args.append(f'--{k}')
+                _args.append(str(v))
 
-        _args = map(str, _args)
+        _args.append('write_flash')
+        for k, v in data['flash_files'].items():
+            _args.append(str(k))
+            _args.append(str(v))
+        _args.extend(data['write_flash_args'])
 
-        esptool.main(['-b', str(self.esptool_baud), *_args], esp=self.esp)
+        esptool.main(_args, esp=self.esp)
 
         os.chdir(current_wk)