diff --git a/tools/ci/config/target-test.yml b/tools/ci/config/target-test.yml
index 3e169f97a..a4137958e 100644
--- a/tools/ci/config/target-test.yml
+++ b/tools/ci/config/target-test.yml
@@ -106,6 +106,7 @@
     CONFIG_FILE_PATH: "${CI_PROJECT_DIR}/components/idf_test/unit_test/CIConfigs"
     LOG_PATH: "$CI_PROJECT_DIR/TEST_LOGS"
     ENV_FILE: "$CI_PROJECT_DIR/ci-test-runner-configs/$CI_RUNNER_DESCRIPTION/EnvConfig.yml"
+    PYTHON_VER: 3
 
 .test_template:
   stage: target_test
@@ -453,7 +454,7 @@ UT_034:
 
 UT_035:
   extends: .unit_test_template
-  parallel: 31
+  parallel: 22
   tags:
     - ESP32S2BETA_IDF
     - UT_T1_1
diff --git a/tools/ci/python_packages/tiny_test_fw/DUT.py b/tools/ci/python_packages/tiny_test_fw/DUT.py
index c5139c628..b9b91e8ec 100644
--- a/tools/ci/python_packages/tiny_test_fw/DUT.py
+++ b/tools/ci/python_packages/tiny_test_fw/DUT.py
@@ -53,7 +53,7 @@ except ImportError:
 import serial
 from serial.tools import list_ports
 
-import Utility
+from . import Utility
 
 
 class ExpectTimeout(ValueError):
diff --git a/tools/ci/python_packages/tiny_test_fw/Env.py b/tools/ci/python_packages/tiny_test_fw/Env.py
index 3f99c9aac..ac30833c8 100644
--- a/tools/ci/python_packages/tiny_test_fw/Env.py
+++ b/tools/ci/python_packages/tiny_test_fw/Env.py
@@ -19,7 +19,7 @@ import functools
 
 import netifaces
 
-import EnvConfig
+from . import EnvConfig
 
 
 def _synced(func):
diff --git a/tools/ci/python_packages/tiny_test_fw/TinyFW.py b/tools/ci/python_packages/tiny_test_fw/TinyFW.py
index f5ef7e1e6..6e2d03d38 100644
--- a/tools/ci/python_packages/tiny_test_fw/TinyFW.py
+++ b/tools/ci/python_packages/tiny_test_fw/TinyFW.py
@@ -22,10 +22,10 @@ from datetime import datetime
 
 import junit_xml
 
-import Env
-import DUT
-import App
-import Utility
+from . import Env
+from . import DUT
+from . import App
+from . import Utility
 
 
 class DefaultEnvConfig(object):
diff --git a/tools/ci/python_packages/ttfw_idf/__init__.py b/tools/ci/python_packages/ttfw_idf/__init__.py
index 8d7f4df63..f03cc71f9 100644
--- a/tools/ci/python_packages/ttfw_idf/__init__.py
+++ b/tools/ci/python_packages/ttfw_idf/__init__.py
@@ -15,8 +15,8 @@ import os
 import re
 
 from tiny_test_fw import TinyFW, Utility
-from IDFApp import IDFApp, Example, LoadableElfExample, UT  # noqa: export all Apps for users
-from IDFDUT import IDFDUT, ESP32DUT, ESP32S2DUT, ESP8266DUT, ESP32QEMUDUT  # noqa: export DUTs for users
+from .IDFApp import IDFApp, Example, LoadableElfExample, UT  # noqa: export all Apps for users
+from .IDFDUT import IDFDUT, ESP32DUT, ESP32S2DUT, ESP8266DUT, ESP32QEMUDUT  # noqa: export DUTs for users
 
 
 def format_case_id(chip, case_name):
diff --git a/tools/unit-test-app/unit_test.py b/tools/unit-test-app/unit_test.py
index 3d5e4fe77..f78692667 100755
--- a/tools/unit-test-app/unit_test.py
+++ b/tools/unit-test-app/unit_test.py
@@ -354,7 +354,7 @@ class Handler(threading.Thread):
 
         def device_wait_action(data):
             start_time = time.time()
-            expected_signal = data[0]
+            expected_signal = data[0].encode('utf-8')
             while 1:
                 if time.time() > start_time + self.timeout:
                     Utility.console_log("Timeout in device for function: %s" % self.child_case_name, color="orange")