diff --git a/lib/hidapi/native.py b/lib/hidapi/native.py
index 2204cbab..16f57272 100644
--- a/lib/hidapi/native.py
+++ b/lib/hidapi/native.py
@@ -82,8 +82,8 @@ del namedtuple
 def _makeDeviceInfo(native_device_info):
 	return DeviceInfo(
 				path=native_device_info.path.decode('ascii'),
-				vendor_id=hex(native_device_info.vendor_id)[2:],
-				product_id=hex(native_device_info.product_id)[2:],
+				vendor_id=hex(native_device_info.vendor_id)[2:].zfill(4),
+				product_id=hex(native_device_info.product_id)[2:].zfill(4),
 				serial=native_device_info.serial if native_device_info.serial else None,
 				release=hex(native_device_info.release)[2:],
 				manufacturer=native_device_info.manufacturer,
@@ -187,22 +187,19 @@ def enumerate(vendor_id=None, product_id=None, interface_number=None):
 	List all the HID devices attached to the system, optionally filtering by
 	vendor_id, product_id, and/or interface_number.
 
-	:returns: a list of matching ``DeviceInfo`` tuples.
+	:returns: an iterable of matching ``DeviceInfo`` tuples.
 	"""
-	results = []
 
 	devices = _native.hid_enumerate(vendor_id, product_id)
 	d = devices
 	while d:
 		if interface_number is None or interface_number == d.contents.interface:
-			results.append(_makeDeviceInfo(d.contents))
+			yield _makeDeviceInfo(d.contents)
 		d = d.contents.next_device
 
 	if devices:
 		_native.hid_free_enumeration(devices)
 
-	return results
-
 
 def open(vendor_id, product_id, serial=None):
 	"""Open a HID device by its Vendor ID, Product ID and optional serial number.
@@ -378,15 +375,3 @@ def get_indexed_string(device_handle, index):
 	:param index: the index of the string to get.
 	"""
 	return _read_wchar(_native.hid_get_indexed_string, device_handle, index)
-
-
-def last_error(device_handle):
-	"""Get a string describing the last error which occurred.
-
-	Note: currently not working in either underlying native implementation.
-
-	:param device_handle: a device handle returned by open() or open_path().
-	:returns: a string containing the last error which occurred, or None.
-	"""
-	error = _native.hid_error(device_handle)
-	return error.value
diff --git a/lib/logitech/unifying_receiver/api.py b/lib/logitech/unifying_receiver/api.py
index 39aa36b0..21b71d56 100644
--- a/lib/logitech/unifying_receiver/api.py
+++ b/lib/logitech/unifying_receiver/api.py
@@ -96,7 +96,7 @@ class Receiver(object):
 			reply = _base.request(self.handle, 0xFF, b'\x83\xB5', b'\x02')
 			if reply and reply[0:1] == b'\x02':
 				fw_version = _hex(reply[1:5])
-				fw_version = '%s.%s.%s' % (fw_version[0:2], fw_version[2:4], fw_version[4:8])
+				fw_version = '%s.%s.B%s' % (fw_version[0:2], fw_version[2:4], fw_version[4:8])
 				firmware.append(_FirmwareInfo(0, FIRMWARE_KIND[0], '', fw_version, None))
 
 			reply = _base.request(self.handle, 0xFF, b'\x81\xF1', b'\x04')
diff --git a/lib/logitech/unifying_receiver/base.py b/lib/logitech/unifying_receiver/base.py
index 249ad7d3..12cbd07b 100644
--- a/lib/logitech/unifying_receiver/base.py
+++ b/lib/logitech/unifying_receiver/base.py
@@ -110,13 +110,7 @@ def try_open(path):
 			# 'device 0 unreachable' is the expected reply from a valid receiver handle
 			_log.info("[%s] success: handle %X", path, receiver_handle)
 			return receiver_handle
-
-		# any other replies are ignored, and will assume this is the wrong Linux device
-		if reply == b'\x01\x00\x00\x00\x00\x00\x00\x00':
-			# no idea what this is, but it comes up occasionally
-			_log.debug("[%s] %X mistery reply [%s]", path, receiver_handle, _hex(reply))
-		else:
-			_log.debug("[%s] %X unknown reply [%s]", path, receiver_handle, _hex(reply))
+		_log.debug("[%s] %X ignored reply %s", path, receiver_handle, _hex(reply))
 	else:
 		_log.debug("[%s] %X no reply", path, receiver_handle)
 
diff --git a/lib/logitech/unifying_receiver/tests/test_30_base.py b/lib/logitech/unifying_receiver/tests/test_30_base.py
index ea24d1ac..45f87532 100644
--- a/lib/logitech/unifying_receiver/tests/test_30_base.py
+++ b/lib/logitech/unifying_receiver/tests/test_30_base.py
@@ -27,8 +27,8 @@ class Test_UR_Base(unittest.TestCase):
 	def test_10_list_receiver_devices(self):
 		rawdevices = base.list_receiver_devices()
 		self.assertIsNotNone(rawdevices, "list_receiver_devices returned None")
-		self.assertIsInstance(rawdevices, list, "list_receiver_devices should have returned a list")
-		Test_UR_Base.ur_available = len(rawdevices) > 0
+		# self.assertIsInstance(rawdevices, Iterable, "list_receiver_devices should have returned an iterable")
+		Test_UR_Base.ur_available = len(list(rawdevices)) > 0
 
 	def test_20_try_open(self):
 		if not self.ur_available: