diff --git a/pymammotion/proto/mctrl_sys.proto b/pymammotion/proto/mctrl_sys.proto
index f1284bd..08dece7 100644
--- a/pymammotion/proto/mctrl_sys.proto
+++ b/pymammotion/proto/mctrl_sys.proto
@@ -196,7 +196,7 @@ message LoraCfgRsp {
   int32 result = 1;
   int32 op = 2;
   string cfg = 3;
-  string fac_cfg = 4;
+  bytes fac_cfg = 4;
 }
 
 message mod_fw_info {
diff --git a/pymammotion/proto/mctrl_sys.py b/pymammotion/proto/mctrl_sys.py
index feafc17..36a6c14 100644
--- a/pymammotion/proto/mctrl_sys.py
+++ b/pymammotion/proto/mctrl_sys.py
@@ -312,7 +312,7 @@ class LoraCfgRsp(betterproto.Message):
     result: int = betterproto.int32_field(1)
     op: int = betterproto.int32_field(2)
     cfg: str = betterproto.string_field(3)
-    fac_cfg: str = betterproto.string_field(4)
+    fac_cfg: bytes = betterproto.bytes_field(4)
 
 
 @dataclass
diff --git a/pymammotion/proto/mctrl_sys_pb2.pyi b/pymammotion/proto/mctrl_sys_pb2.pyi
index cd166bd..6d224e1 100644
--- a/pymammotion/proto/mctrl_sys_pb2.pyi
+++ b/pymammotion/proto/mctrl_sys_pb2.pyi
@@ -82,7 +82,7 @@ class LoraCfgRsp(_message.Message):
     OP_FIELD_NUMBER: _ClassVar[int]
     RESULT_FIELD_NUMBER: _ClassVar[int]
     cfg: str
-    fac_cfg: str
+    fac_cfg: bytes
     op: int
     result: int
     def __init__(self, result: _Optional[int] = ..., op: _Optional[int] = ..., cfg: _Optional[str] = ..., fac_cfg: _Optional[str] = ...) -> None: ...
diff --git a/pyproject.toml b/pyproject.toml
index c9084bd..86239a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,10 +1,10 @@
 [project]
 name        = "pymammotion"
-version     = "0.2.13"
+version     = "0.2.15"
 
 [tool.poetry]
 name        = "pymammotion"
-version     = "0.2.13"
+version     = "0.2.15"
 license     = "GNU-3.0"
 description = ""
 readme      = "README.md"
@@ -53,7 +53,7 @@ mypy = "^1.10.0"
 pre-commit = "^3.7.1"
 
 [tool.bumpver]
-current_version = "0.2.13"
+current_version = "0.2.15"
 version_pattern = "MAJOR.MINOR.PATCH"
 commit_message  = "Bump version {old_version} -> {new_version}"
 commit          = true