diff --git a/source/os/release/include/shell.h b/source/os/release/include/shell.h
index c242e8d..1b176ee 100644
--- a/source/os/release/include/shell.h
+++ b/source/os/release/include/shell.h
@@ -19,5 +19,6 @@ struct command {
 
 int shell_init(const struct driver *shell_device);
 int shell_add_command(struct command *command);
+int shell_write(const char *buffer, unsigned int len);
 
 #endif /* SOURCE_FIRMWARE_KERNEL_INTERFACE_SHELL_H_ */
diff --git a/source/os/release/libkosmos-arm-stm32f4-discovery-0.1.5.250.a b/source/os/release/libkosmos-arm-stm32f4-discovery-0.1.6.257.a
similarity index 92%
rename from source/os/release/libkosmos-arm-stm32f4-discovery-0.1.5.250.a
rename to source/os/release/libkosmos-arm-stm32f4-discovery-0.1.6.257.a
index c1d60ea..f39b357 100644
Binary files a/source/os/release/libkosmos-arm-stm32f4-discovery-0.1.5.250.a and b/source/os/release/libkosmos-arm-stm32f4-discovery-0.1.6.257.a differ
diff --git a/source/os/release/libkosmos-arm-stm32f4-discovery.a b/source/os/release/libkosmos-arm-stm32f4-discovery.a
index f542b68..6ab1828 120000
--- a/source/os/release/libkosmos-arm-stm32f4-discovery.a
+++ b/source/os/release/libkosmos-arm-stm32f4-discovery.a
@@ -1 +1 @@
-libkosmos-arm-stm32f4-discovery-0.1.5.250.a
\ No newline at end of file
+libkosmos-arm-stm32f4-discovery-0.1.6.257.a
\ No newline at end of file