diff --git a/devicemodel/samples/bridge.sh b/devicemodel/samples/bridge.sh
index f06ccc348..063844822 100755
--- a/devicemodel/samples/bridge.sh
+++ b/devicemodel/samples/bridge.sh
@@ -49,4 +49,5 @@ EOF
 fi
 
 # add tap device under the bridge
+ifconfig acrn_tap0 up
 brctl addif acrn-br0 acrn_tap0
diff --git a/devicemodel/samples/launch_uos.sh b/devicemodel/samples/launch_uos.sh
index efb884a7d..cea22c8ba 100755
--- a/devicemodel/samples/launch_uos.sh
+++ b/devicemodel/samples/launch_uos.sh
@@ -13,20 +13,15 @@ if [[ "$result" != "" ]]; then
   exit
 fi
 
-
 #for memsize setting
-memsize=`cat /proc/meminfo|head -n 1|awk '{print $2}'`
-if [ $memsize -gt 4000000 ];then
-    mem_size=1750M
-fi
-
 mem_size=1000M
 
-./acrn-dm -A -m $mem_size -c $2 -s 0:0,hostbridge -s 1:0,lpc -l com1,stdio \
+acrn-dm -A -m $mem_size -c $2 -s 0:0,hostbridge -s 1:0,lpc -l com1,stdio \
   -s 5,virtio-console,@pty:pty_port \
   -s 6,virtio-hyper_dmabuf \
-  -s 3,virtio-blk,/home/root/clear.img \
-  -s 4,virtio-net,tap0 -k /home/root/bzImage \
+  -s 3,virtio-blk,/root/clear-21180-kvm.img \
+  -s 4,virtio-net,tap0 \
+  -k /usr/lib/kernel/org.clearlinux.pk414-standard.4.14.23-19 \
   -B "root=/dev/vda3 rw rootwait noxsave maxcpus=$2 nohpet console=tty0 console=hvc0 \
   console=ttyS0 no_timer_check ignore_loglevel log_buf_len=16M \
   consoleblank=0 tsc=reliable i915.avail_planes_per_pipe=$4 \