fix: 下载脚本改为纯 ASCII，避免 cmd 按 GBK 拆行

Co-authored-by: Cursor <cursoragent@cursor.com>

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

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 删除临时文件-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 生成配置文件升级文件
+@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 常用命令说明
-@rem -format vm        //擦除VM 区域
-@rem -format cfg       //擦除BT CFG 区域
-@rem -format 0x3f0-2   //表示从第 0x3f0 个 sector 开始连续擦除 2 个 sector(第一个参数为16进制或10进制都可，第二个参数必须是10进制)
+@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