diff --git a/kernel/Makefile b/kernel/Makefile
index 9ed8b9d..5f54b5a 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -45,7 +45,7 @@ k210_lib := ../tools/k210/libkendryte.a
 export ARCH = $(arch)
 export BOARD = $(board)
 export SMP = $(smp)
-export SFSIMG = $(user_dir)/build/$(arch).img
+export SFSIMG = $(user_dir)/build/$(arch).qcow2
 ifeq ($(arch), aarch64)
 board := raspi3
 endif
diff --git a/user b/user
index bf9d296..ce51c9b 160000
--- a/user
+++ b/user
@@ -1 +1 @@
-Subproject commit bf9d296331fd160849abd45faf361941b533c08d
+Subproject commit ce51c9b2ecb3195862cb761055e956de0b8f7803