diff --git a/pyprusalink/types.py b/pyprusalink/types.py
index 6c621da..5563f51 100644
--- a/pyprusalink/types.py
+++ b/pyprusalink/types.py
@@ -64,20 +64,29 @@ class VersionInfo(TypedDict):
 
 
 class PrinterInfo(TypedDict):
-    """Printer informations."""
-
-    mmu: bool | None
-    name: str | None
-    location: str | None
-    farm_mode: bool | None
-    nozzle_diameter: float | None
-    min_extrusion_temp: int | None
-    serial: str | None
-    sd_ready: bool | None
-    active_camera: bool | None
-    hostname: str | None
-    port: str | None
-    network_error_chime: bool | None
+    """Printer information from /api/v1/info.
+
+    The set of fields returned varies by firmware version and printer
+    model — older firmware may omit fields like `min_extrusion_temp` or
+    `network_error_chime`, and a Buddy printer not in farm mode may omit
+    `farm_mode`. Treat any missing key as "not reported", not
+    "false/zero/empty".
+
+    Use `dict.get()` or `key in info` rather than indexing.
+    """
+
+    mmu: NotRequired[bool]
+    name: NotRequired[str]
+    location: NotRequired[str]
+    farm_mode: NotRequired[bool]
+    nozzle_diameter: NotRequired[float]
+    min_extrusion_temp: NotRequired[int]
+    serial: NotRequired[str]
+    sd_ready: NotRequired[bool]
+    active_camera: NotRequired[bool]
+    hostname: NotRequired[str]
+    port: NotRequired[str]
+    network_error_chime: NotRequired[bool]
 
 
 class StatusInfo(TypedDict):
diff --git a/tests/test_prusalink.py b/tests/test_prusalink.py
index ba778a4..0477e92 100644
--- a/tests/test_prusalink.py
+++ b/tests/test_prusalink.py
@@ -75,6 +75,25 @@ async def test_get_info(pl, respx_mock):
     assert result["nozzle_diameter"] == 0.4
 
 
+async def test_get_info_minimal_firmware(pl, respx_mock):
+    """Older firmware may omit several PrinterInfo fields."""
+    respx_mock.get(f"{HOST}/api/v1/info").mock(
+        return_value=httpx.Response(
+            200,
+            json={
+                "serial": "CZPX4720X004XC34242",
+                "nozzle_diameter": 0.4,
+                "hostname": "prusa-mk3",
+            },
+        )
+    )
+    result = await pl.get_info()
+    assert result["serial"] == "CZPX4720X004XC34242"
+    assert "min_extrusion_temp" not in result
+    assert "network_error_chime" not in result
+    assert "farm_mode" not in result
+
+
 async def test_get_status(pl, respx_mock):
     respx_mock.get(f"{HOST}/api/v1/status").mock(
         return_value=httpx.Response(