diff --git a/src/boot.py b/src/boot.py
index e69de29bb2..ac87751639 100644
--- a/src/boot.py
+++ b/src/boot.py
@@ -0,0 +1,6 @@
+import sys
+
+if sys.platform in ['trezor', 'pyboard']: # stmhal
+    import pyb
+    # hid=(subclass, protocol, max_packet_len, polling_interval, report_desc)
+    pyb.usb_mode('CDC+HID', vid=0x1209, pid=0x53C1, hid=(0, 0, 64, 1, b'\x06\x00\xff\x09\x01\xa1\x01\x09\x20\x15\x00\x26\xff\x00\x75\x08\x95\x40\x81\x02\x09\x21\x15\x00\x26\xff\x00\x75\x08\x95\x40\x91\x02\xc0'))
diff --git a/src/trezor/config.py b/src/trezor/config.py
index 8eee439661..40d707bf6d 100644
--- a/src/trezor/config.py
+++ b/src/trezor/config.py
@@ -1,50 +1,40 @@
 import sys
+import ustruct
 
-if sys.platform == 'trezor': # stmhal - use binary module (not working atm)
+# mock implementation using binary file
 
-    from TrezorConfig import Config
+_mock = {}
 
-    _config = Config()
-
-    def get(app, key, default=None):
-        v = _config.get(app, key)
-        return v if v else default
-
-    def set(app, key, value):
-        return _config.set(app, key, value)
-
-else: # emulator (mock implementation using binary file)
-
-    import ustruct
-
-    _mock = {}
+if sys.platform in ['trezor', 'pyboard']: # stmhal
+    _file = '/flash/trezor.config'
+else:
     _file = '/var/tmp/trezor.config'
 
-    def _load():
-        try:
-            with open(_file, 'rb') as f:
-                while True:
-                    d = f.read(4)
-                    if len(d) != 4:
-                        break
-                    k, l = ustruct.unpack('<HH', d)
-                    v = f.read(l)
-                    _mock[k] = v
-        except OSError:
-            pass
+def _load():
+    try:
+        with open(_file, 'rb') as f:
+            while True:
+                d = f.read(4)
+                if len(d) != 4:
+                    break
+                k, l = ustruct.unpack('<HH', d)
+                v = f.read(l)
+                _mock[k] = v
+    except OSError:
+        pass
 
-    def _save():
-        with open(_file, 'wb') as f:
-            for k, v in _mock.items():
-                f.write(ustruct.pack('<HH', k, len(v)))
-                f.write(v)
+def _save():
+    with open(_file, 'wb') as f:
+        for k, v in _mock.items():
+            f.write(ustruct.pack('<HH', k, len(v)))
+            f.write(v)
 
-    _load()
+_load()
 
-    def get(app, key, default=None):
-        return _mock.get((app << 8) | key, default)
+def get(app, key, default=None):
+    return _mock.get((app << 8) | key, default)
 
-    def set(app, key, value):
-        _mock[(app << 8) | key] = value
-        _save()
-        return True
+def set(app, key, value):
+    _mock[(app << 8) | key] = value
+    _save()
+    return True
diff --git a/src/trezor/config.py.real b/src/trezor/config.py.real
new file mode 100644
index 0000000000..641ce9ce5b
--- /dev/null
+++ b/src/trezor/config.py.real
@@ -0,0 +1,10 @@
+from TrezorConfig import Config
+
+_config = Config()
+
+def get(app, key, default=None):
+    v = _config.get(app, key)
+    return v if v else default
+
+def set(app, key, value):
+    return _config.set(app, key, value)