diff --git a/examples/query_fw_versions.py b/examples/query_fw_versions.py
index c6704f0d4..934bd716b 100755
--- a/examples/query_fw_versions.py
+++ b/examples/query_fw_versions.py
@@ -9,63 +9,68 @@ if __name__ == "__main__":
   results = {}
 
   panda = Panda()
-  panda.set_safety_mode(Panda.SAFETY_ALLOUTPUT)
+  panda.set_safety_mode(Panda.SAFETY_ELM327)
   print("querying addresses ...")
-  for addr in tqdm(addrs):
-    # skip functional broadcast addrs
-    if addr == 0x7df or addr == 0x18db33f1:
-      continue
+  with tqdm(addrs) as t:
+    for addr in t:
+      # skip functional broadcast addrs
+      if addr == 0x7df or addr == 0x18db33f1:
+        continue
+      t.set_description(hex(addr))
 
-    uds_client = UdsClient(panda, addr, bus=1 if panda.has_obd() else 0, timeout=0.1, debug=False)
-    try:
-      uds_client.tester_present()
-    except NegativeResponseError:
-      pass
-    except MessageTimeoutError:
-      continue
+      uds_client = UdsClient(panda, addr, bus=1 if panda.has_obd() else 0, timeout=0.1, debug=False)
+      try:
+        uds_client.tester_present()
+      except NegativeResponseError:
+        pass
+      except MessageTimeoutError:
+        continue
 
-    resp = {}
+      resp = {}
 
-    try:
-      data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_IDENTIFICATION)
-      if data: resp[DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_IDENTIFICATION] = data
-    except NegativeResponseError:
-      pass
+      try:
+        data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_IDENTIFICATION)
+        if data: resp[DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_IDENTIFICATION] = data
+      except NegativeResponseError:
+        pass
 
-    try:
-      data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_IDENTIFICATION)
-      if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_IDENTIFICATION] = data
-    except NegativeResponseError:
-      pass
+      try:
+        data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_IDENTIFICATION)
+        if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_IDENTIFICATION] = data
+      except NegativeResponseError:
+        pass
 
-    try:
-      data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_DATA_IDENTIFICATION)
-      if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_DATA_IDENTIFICATION] = data
-    except NegativeResponseError:
-      pass
+      try:
+        data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_DATA_IDENTIFICATION)
+        if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_DATA_IDENTIFICATION] = data
+      except NegativeResponseError:
+        pass
 
-    try:
-      data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_FINGERPRINT)
-      if data: resp[DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_FINGERPRINT] = data
-    except NegativeResponseError:
-      pass
+      try:
+        data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_FINGERPRINT)
+        if data: resp[DATA_IDENTIFIER_TYPE.BOOT_SOFTWARE_FINGERPRINT] = data
+      except NegativeResponseError:
+        pass
 
-    try:
-      data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_FINGERPRINT)
-      if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_FINGERPRINT] = data
-    except NegativeResponseError:
-      pass
+      try:
+        data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_FINGERPRINT)
+        if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_SOFTWARE_FINGERPRINT] = data
+      except NegativeResponseError:
+        pass
 
-    try:
-      data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_DATA_FINGERPRINT)
-      if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_DATA_FINGERPRINT] = data
-    except NegativeResponseError:
-      pass
+      try:
+        data = uds_client.read_data_by_identifier(DATA_IDENTIFIER_TYPE.APPLICATION_DATA_FINGERPRINT)
+        if data: resp[DATA_IDENTIFIER_TYPE.APPLICATION_DATA_FINGERPRINT] = data
+      except NegativeResponseError:
+        pass
 
-    if resp.keys():
-      results[addr] = resp
+      if resp.keys():
+        results[addr] = resp
 
-  print("results:")
-  for addr, resp in results.items():
-    for id, dat in resp.items():
-      print(hex(addr), hex(id), dat.decode())
+    print("results:")
+    if len(results.items()):
+      for addr, resp in results.items():
+        for id, dat in resp.items():
+          print(hex(addr), hex(id), dat.decode())
+    else:
+      "no fw versions found!"
diff --git a/python/uds.py b/python/uds.py
index 190796bb6..ee9e9ea66 100644
--- a/python/uds.py
+++ b/python/uds.py
@@ -436,7 +436,12 @@ class IsoTpMessage():
         # wait (do nothing until next flow control message)
         if self.debug: print("ISO-TP: TX - flow control wait")
 
+FUNCTIONAL_ADDRS = [0x7DF, 0x18DB33F1]
+
 def get_rx_addr_for_tx_addr(tx_addr):
+  if tx_addr in FUNCTIONAL_ADDRS:
+    return None
+
   if tx_addr < 0xFFF8:
     # standard 11 bit response addr (add 8)
     return tx_addr + 8