diff --git a/ArduBlockTool/tool/ardublock_letsgoing_21.jar b/ArduBlockTool/tool/ardublock_letsgoing_21.jar
deleted file mode 100644
index 551a29c77cdc28d1a9d6dee8d5a199eae307f037..0000000000000000000000000000000000000000
Binary files a/ArduBlockTool/tool/ardublock_letsgoing_21.jar and /dev/null differ