diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..dacd60b
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,16 @@
+# Windows cmd.exe 按系统 ANSI（中文 Windows 为 GBK）解析 .bat
+# 因此：换行必须是 CRLF；.bat 正文保持纯 ASCII，不要写中文
+*.bat text eol=crlf
+*.cmd text eol=crlf
+
+# 厂商二进制 / 库：禁止当文本做换行转换
+*.exe binary
+*.dll binary
+*.a binary
+*.bin binary
+*.boot binary
+*.key binary
+*.ufw binary
+*.fw binary
+*.wts binary
+*.uart binary
diff --git a/cpu/br28/tools/download.c b/cpu/br28/tools/download.c
index 4d23cfb..a55c38d 100644
--- a/cpu/br28/tools/download.c
+++ b/cpu/br28/tools/download.c
@@ -189,7 +189,7 @@ call download/earphone/download.bat
 #else
 call download/earphone/download_app_ota.bat
 #endif
-#elif defined(CONFIG_HID_CASE_ENABLE) ||defined(CONFIG_SPP_AND_LE_CASE_ENABLE)||defined(CONFIG_MESH_CASE_ENABLE)||defined(CONFIG_DONGLE_CASE_ENABLE)    //数传
+#elif defined(CONFIG_HID_CASE_ENABLE) ||defined(CONFIG_SPP_AND_LE_CASE_ENABLE)||defined(CONFIG_MESH_CASE_ENABLE)||defined(CONFIG_DONGLE_CASE_ENABLE)    // data-trans
 call download/data_trans/download.bat
 #else
 //to do other case
diff --git a/cpu/br28/tools/download/earphone/download_app_ota.bat b/cpu/br28/tools/download/earphone/download_app_ota.bat
index bb583c5..59fc4df 100644
--- a/cpu/br28/tools/download/earphone/download_app_ota.bat
+++ b/cpu/br28/tools/download/earphone/download_app_ota.bat
@@ -15,8 +15,8 @@ copy ..\..\anc_gains.bin .
 :: -format all  -key RS-5B88.key
 ::-reboot 2500
 
-@rem ɾ����ʱ�ļ�-format all
-if exist *.mp3 del *.mp3 
+@rem delete temp files
+if exist *.mp3 del *.mp3
 if exist *.PIX del *.PIX
 if exist *.TAB del *.TAB
 if exist *.res del *.res
@@ -26,10 +26,10 @@ if exist *.sty del *.sty
 copy jl_isd.ufw update.ufw
 del jl_isd.ufw
 
-@REM ���������ļ������ļ�
+@rem generate config ufw (disabled)
 ::ufw_maker.exe -chip AC800X %ADD_KEY% -output config.ufw -res bt_cfg.cfg
 
-::IF EXIST jl_696x.bin del jl_696x.bin 
+::IF EXIST jl_696x.bin del jl_696x.bin
 
 if exist script.ver del script.ver
 if exist tone.cfg del tone.cfg
@@ -38,10 +38,10 @@ if exist br28loader.bin del br28loader.bin
 if exist anc_coeff.bin del anc_coeff.bin
 if exist anc_gains.bin del anc_gains.bin
 
-@rem ��������˵��
-@rem -format vm        //����VM ����
-@rem -format cfg       //����BT CFG ����
-@rem -format 0x3f0-2   //��ʾ�ӵ� 0x3f0 �� sector ��ʼ�������� 2 �� sector(��һ������Ϊ16���ƻ�10���ƶ��ɣ��ڶ�������������10����)
+@rem common isd_download flags
+@rem -format vm
+@rem -format cfg
+@rem -format 0x3f0-2
 
 ping /n 2 127.1>null
-IF EXIST null del null
+IF EXIST null del null
\ No newline at end of file