diff --git a/keepkeylib/erc7730_compiler.py b/keepkeylib/erc7730_compiler.py
index b62cdb70..25d2a515 100644
--- a/keepkeylib/erc7730_compiler.py
+++ b/keepkeylib/erc7730_compiler.py
@@ -605,8 +605,12 @@ def intern_path(steps):
                     arguments.append((2, 1, literal_path))
                 elif isinstance(token, str):
                     arguments.append((2, 1, intern_path(_resolve_path(root, token))))
-                else:
+                elif token is not None:
                     raise ValueError("tokenAmount requires token or tokenPath")
+                elif any(key in params for key in (
+                        "threshold", "message", "chainId", "chainIdPath")):
+                    raise ValueError(
+                        "unknown token amount cannot use token metadata parameters")
                 if "threshold" in params:
                     threshold = descriptor_value(params["threshold"])
                     if isinstance(threshold, str) and threshold.startswith("0x"):
@@ -627,7 +631,7 @@ def intern_path(steps):
                         raise ValueError("invalid tokenAmount chainId")
                 aliases = params.get("nativeCurrencyAddress", ())
                 aliases = descriptor_value(aliases)
-                if aliases:
+                if aliases and token is not None:
                     if isinstance(aliases, str):
                         aliases = [aliases]
                     references = []
diff --git a/tests/test_erc7730_compiler.py b/tests/test_erc7730_compiler.py
index f108eff0..a8544e64 100644
--- a/tests/test_erc7730_compiler.py
+++ b/tests/test_erc7730_compiler.py
@@ -269,6 +269,28 @@ def test_compiles_recursive_array_iteration_frames():
             subprocess.check_call([validator, output.name])
 
 
+def test_token_amount_without_token_uses_firmware_raw_fallback():
+    descriptor = {"display": {"formats": {
+        "quote(uint256 amount)": {
+            "intent": "Review quote",
+            "fields": [{"path": "amount", "label": "Unknown token amount",
+                        "format": "tokenAmount"}],
+        }
+    }}}
+    compiled = compile_calldata(
+        descriptor, "quote(uint256 amount)", 1,
+        "0x1111111111111111111111111111111111111111")
+    formatter = _sections(compiled)[6]
+    assert formatter[2:5] == bytes([3, 0, 1])
+    assert formatter[5:9] == bytes([1, 1, 0, 0])
+    validator = os.environ.get("ERC7730_FIRMWARE_VALIDATOR")
+    if validator:
+        with tempfile.NamedTemporaryFile() as output:
+            output.write(compiled)
+            output.flush()
+            subprocess.check_call([validator, output.name])
+
+
 def test_compiles_typed_if_not_in_and_must_match_conditions():
     descriptor = {"display": {"formats": {
         "guard(uint256 mode,address recipient)": {