diff --git a/electrum/plugins/hw_wallet/trezor_qt_pinmatrix.py b/electrum/plugins/hw_wallet/trezor_qt_pinmatrix.py
new file mode 100644
index 000000000..fdde22d2f
--- /dev/null
+++ b/electrum/plugins/hw_wallet/trezor_qt_pinmatrix.py
@@ -0,0 +1,176 @@
+# from https://github.com/trezor/trezor-firmware/blob/3f1d2059ca140788dab8726778f05cedbea20bc4/python/src/trezorlib/qt/pinmatrix.py
+#
+# This file is part of the Trezor project.
+#
+# Copyright (C) 2012-2022 SatoshiLabs and contributors
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3
+# as published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the License along with this library.
+# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
+
+import math
+import sys
+from typing import Any
+
+try:
+    from PyQt5.QtCore import QT_VERSION_STR, QRegExp, Qt
+    from PyQt5.QtGui import QRegExpValidator
+    from PyQt5.QtWidgets import (
+        QApplication,
+        QGridLayout,
+        QHBoxLayout,
+        QLabel,
+        QLineEdit,
+        QPushButton,
+        QSizePolicy,
+        QVBoxLayout,
+        QWidget,
+    )
+except Exception:
+    from PyQt4.QtCore import QT_VERSION_STR, SIGNAL, QObject, QRegExp, Qt  # noqa: I
+    from PyQt4.QtGui import (  # noqa: I
+        QApplication,
+        QGridLayout,
+        QHBoxLayout,
+        QLabel,
+        QLineEdit,
+        QPushButton,
+        QRegExpValidator,
+        QSizePolicy,
+        QVBoxLayout,
+        QWidget,
+    )
+
+
+class PinButton(QPushButton):
+    def __init__(self, password: QLineEdit, encoded_value: int) -> None:
+        super(PinButton, self).__init__("?")
+        self.password = password
+        self.encoded_value = encoded_value
+
+        if QT_VERSION_STR >= "5":
+            self.clicked.connect(self._pressed)
+        elif QT_VERSION_STR >= "4":
+            QObject.connect(self, SIGNAL("clicked()"), self._pressed)
+        else:
+            raise RuntimeError("Unsupported Qt version")
+
+    def _pressed(self) -> None:
+        self.password.setText(self.password.text() + str(self.encoded_value))
+        self.password.setFocus()
+
+
+class PinMatrixWidget(QWidget):
+    """
+    Displays widget with nine blank buttons and password box.
+    Encodes button clicks into sequence of numbers for passing
+    into PinAck messages of Trezor.
+
+    show_strength=True may be useful for entering new PIN
+    """
+
+    def __init__(self, show_strength: bool = True, parent: Any = None) -> None:
+        super(PinMatrixWidget, self).__init__(parent)
+
+        self.password = QLineEdit()
+        self.password.setValidator(QRegExpValidator(QRegExp("[1-9]+"), None))
+        self.password.setEchoMode(QLineEdit.Password)
+
+        if QT_VERSION_STR >= "5":
+            self.password.textChanged.connect(self._password_changed)
+        elif QT_VERSION_STR >= "4":
+            QObject.connect(
+                self.password, SIGNAL("textChanged(QString)"), self._password_changed
+            )
+        else:
+            raise RuntimeError("Unsupported Qt version")
+
+        self.strength = QLabel()
+        self.strength.setMinimumWidth(75)
+        self.strength.setAlignment(Qt.AlignCenter)
+        self._set_strength(0)
+
+        grid = QGridLayout()
+        grid.setSpacing(0)
+        for y in range(3)[::-1]:
+            for x in range(3):
+                button = PinButton(self.password, x + y * 3 + 1)
+                button.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+                button.setFocusPolicy(Qt.NoFocus)
+                grid.addWidget(button, 3 - y, x)
+
+        hbox = QHBoxLayout()
+        hbox.addWidget(self.password)
+        if show_strength:
+            hbox.addWidget(self.strength)
+
+        vbox = QVBoxLayout()
+        vbox.addLayout(grid)
+        vbox.addLayout(hbox)
+        self.setLayout(vbox)
+
+    def _set_strength(self, strength: float) -> None:
+        if strength < 3000:
+            self.strength.setText("weak")
+            self.strength.setStyleSheet("QLabel { color : #d00; }")
+        elif strength < 60000:
+            self.strength.setText("fine")
+            self.strength.setStyleSheet("QLabel { color : #db0; }")
+        elif strength < 360000:
+            self.strength.setText("strong")
+            self.strength.setStyleSheet("QLabel { color : #0a0; }")
+        else:
+            self.strength.setText("ULTIMATE")
+            self.strength.setStyleSheet("QLabel { color : #000; font-weight: bold;}")
+
+    def _password_changed(self, password: Any) -> None:
+        self._set_strength(self.get_strength())
+
+    def get_strength(self) -> float:
+        digits = len(set(str(self.password.text())))
+        strength = math.factorial(9) / math.factorial(9 - digits)
+        return strength
+
+    def get_value(self) -> str:
+        return self.password.text()
+
+
+if __name__ == "__main__":
+    """
+    Demo application showing PinMatrix widget in action
+    """
+    app = QApplication(sys.argv)
+
+    matrix = PinMatrixWidget()
+
+    def clicked() -> None:
+        print("PinMatrix value is", matrix.get_value())
+        print("Possible button combinations:", matrix.get_strength())
+        sys.exit()
+
+    ok = QPushButton("OK")
+    if QT_VERSION_STR >= "5":
+        ok.clicked.connect(clicked)
+    elif QT_VERSION_STR >= "4":
+        QObject.connect(ok, SIGNAL("clicked()"), clicked)
+    else:
+        raise RuntimeError("Unsupported Qt version")
+
+    vbox = QVBoxLayout()
+    vbox.addWidget(matrix)
+    vbox.addWidget(ok)
+
+    w = QWidget()
+    w.setLayout(vbox)
+    w.move(100, 100)
+    w.show()
+
+    app.exec_()