diff --git a/envr-default b/envr-default
index 685c1dc..6ca80ab 100644
--- a/envr-default
+++ b/envr-default
@@ -8,4 +8,4 @@ PYTHON_VENV=.venv
 
 [ALIASES]
 lint=black --check . && isort --check-only . && flake8 . && mypy .
-test=(coverage erase && pytest --cov --maxfail=3 -n auto)
\ No newline at end of file
+test=coverage erase && pytest --cov --maxfail=3 -n auto
\ No newline at end of file
diff --git a/smp/image_management.py b/smp/image_management.py
index 4822346..2cd7b5e 100644
--- a/smp/image_management.py
+++ b/smp/image_management.py
@@ -75,20 +75,23 @@ class ImageUploadWriteRequest(message.WriteRequest):
     upgrade: bool | None = None  # allowed when off == 0
 
 
-class ImageUploadProgressWriteResponse(message.WriteResponse):
+class ImageUploadWriteResponse(message.WriteResponse):
     _GROUP_ID = header.GroupId.IMAGE_MANAGEMENT
     _COMMAND_ID = header.CommandId.ImageManagement.UPLOAD
 
-    rc: int | None = None
     off: int | None = None
+    """The portion of the upload that has been completed, in 8-bit bytes.
 
-
-class ImageUploadFinalWriteResponse(message.WriteResponse):
-    _GROUP_ID = header.GroupId.IMAGE_MANAGEMENT
-    _COMMAND_ID = header.CommandId.ImageManagement.UPLOAD
-
-    off: int | None = None
+    This is the offset of the next byte to be written. If the offset is equal to
+    the length of the image, the upload is complete.
+    """
     match: bool | None = None
+    """Indicates if the uploaded data successfully matches the provided SHA256.
+
+    Only sent in the final packet if CONFIG_IMG_ENABLE_IMAGE_CHECK is enabled.
+    """
+    rc: int | None = None
+    """Unspecified field used by MCUBoot's SMP Server implementation."""
 
 
 class ImageEraseRequest(message.WriteRequest):
diff --git a/tests/test_image_management.py b/tests/test_image_management.py
index a05c233..f0c10ca 100644
--- a/tests/test_image_management.py
+++ b/tests/test_image_management.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import sys
 from typing import cast
 
 import cbor2
@@ -179,3 +180,109 @@ def test_ImageEraseResponse() -> None:
     r = smpimg.ImageEraseResponse.load(cast(smpheader.Header, r.header), {})
     assert_header(r)
     assert smpheader.Header.SIZE + 1 == len(r.BYTES)
+
+
+def test_ImageUploadWriteRequest() -> None:
+    assert_header = make_assert_header(
+        smpheader.GroupId.IMAGE_MANAGEMENT,
+        smpheader.OP.WRITE,
+        smpheader.CommandId.ImageManagement.UPLOAD,
+        None,
+    )
+    r = smpimg.ImageUploadWriteRequest(
+        off=0,
+        data=b"hello",
+        image=1,
+        len=5,
+        sha=b"world",
+        upgrade=True,
+    )
+
+    assert_header(r)
+
+    r = smpimg.ImageUploadWriteRequest.loads(r.BYTES)
+    assert_header(r)
+
+    assert_header = make_assert_header(
+        smpheader.GroupId.IMAGE_MANAGEMENT,
+        smpheader.OP.WRITE,
+        smpheader.CommandId.ImageManagement.UPLOAD,
+        None,
+    )
+    r = smpimg.ImageUploadWriteRequest(
+        off=0,
+        data=b"hello",
+        image=1,
+        len=5,
+        sha=b"world",
+        upgrade=True,
+    )
+
+    assert_header(r)
+    assert r.off == 0
+    assert r.data == b"hello"
+    assert r.image == 1
+    assert r.len == 5
+    assert r.sha == b"world"
+    assert r.upgrade is True
+
+    r = smpimg.ImageUploadWriteRequest.loads(r.BYTES)
+    assert_header(r)
+    assert r.off == 0
+    assert r.data == b"hello"
+    assert r.image == 1
+    assert r.len == 5
+    assert r.sha == b"world"
+    assert r.upgrade is True
+
+    # when off != 0 do not send image, len, sha, or upgrade
+    r = smpimg.ImageUploadWriteRequest(off=10, data=b"hello")
+    assert_header(r)
+    assert r.off == 10
+    assert r.data == b"hello"
+
+
+@pytest.mark.parametrize("off", [None, 0, 1, 0xFFFF, 0xFFFFFFFF])
+@pytest.mark.parametrize("match", [None, True, False])
+@pytest.mark.parametrize("rc", [None, 0, 1, 10])
+def test_ImageUploadWriteResponse(off: int | None, match: bool | None, rc: int | None) -> None:
+    assert_header = make_assert_header(
+        smpheader.GroupId.IMAGE_MANAGEMENT,
+        smpheader.OP.WRITE_RSP,
+        smpheader.CommandId.ImageManagement.UPLOAD,
+        None,
+    )
+    r = smpimg.ImageUploadWriteResponse(off=off, match=match, rc=rc)
+
+    assert_header(r)
+    assert r.off == off
+    assert r.match == match
+    assert r.rc == rc
+
+    r = smpimg.ImageUploadWriteResponse.loads(r.BYTES)
+    assert_header(r)
+    assert r.off == off
+    assert r.match == match
+    assert r.rc == rc
+
+    if sys.version_info >= (3, 9):
+        cbor_dict = (
+            {}
+            | ({"off": off} if off is not None else {})
+            | ({"match": match} if match is not None else {})
+            | ({"rc": rc} if rc is not None else {})
+        )
+    else:
+        cbor_dict = {}
+        if off is not None:
+            cbor_dict["off"] = off
+        if match is not None:
+            cbor_dict["match"] = match
+        if rc is not None:
+            cbor_dict["rc"] = rc
+
+    r = smpimg.ImageUploadWriteResponse.load(cast(smpheader.Header, r.header), cbor_dict)
+    assert_header(r)
+    assert r.off == off
+    assert r.match == match
+    assert r.rc == rc
diff --git a/tests/test_injected_header.py b/tests/test_injected_header.py
index 5d0404e..e70a3ce 100644
--- a/tests/test_injected_header.py
+++ b/tests/test_injected_header.py
@@ -87,7 +87,7 @@ def test_ImageUploadWriteResponse_injected_header() -> None:
         command_id=smphdr.CommandId.ImageManagement.UPLOAD,
     )
 
-    r = smpimg.ImageUploadProgressWriteResponse(
+    r = smpimg.ImageUploadWriteResponse(
         header=smphdr.Header(
             op=h.op,
             version=h.version,