diff --git a/ArduBlockTool/tool/ardublock_letsgoing_21.jar b/ArduBlockTool/tool/ardublock_letsgoing_21.jar
deleted file mode 100755
index 64cfb6c583c8d38f577db0dba692ea7ec49d61dc..0000000000000000000000000000000000000000
Binary files a/ArduBlockTool/tool/ardublock_letsgoing_21.jar and /dev/null differ