diff --git a/target/linux/linux-2.4/ar7.mk b/target/linux/linux-2.4/ar7.mk
index 15f63063bd..db613b0c54 100644
--- a/target/linux/linux-2.4/ar7.mk
+++ b/target/linux/linux-2.4/ar7.mk
@@ -7,9 +7,9 @@
 
 DOWNLOAD_SITE=http://openwrt.org/downloads/sources
 # extracted from netgear DG834B V1.0.5 GPL release
-ATM_FIRMWARE_DIR=sangam-atm-firmware-0.3
+ATM_FIRMWARE_DIR=sangam-atm-firmware-0.4
 ATM_FIRMWARE_FILE=$(ATM_FIRMWARE_DIR).tar.gz
-ATM_FIRMWARE_MD5SUM=a774d2fe7926a5f57cb9f259961e49ae
+ATM_FIRMWARE_MD5SUM=8bfcb31109796502d66b11baaeb2fba6
 
 $(DL_DIR)/$(ATM_FIRMWARE_FILE):
 	$(SCRIPT_DIR)/download.pl $(DL_DIR) $(ATM_FIRMWARE_FILE) $(ATM_FIRMWARE_MD5SUM) $(DOWNLOAD_SITE)