diff --git a/target/linux/ramips/dts/kn.dts b/target/linux/ramips/dts/kn.dts
index 77b047c094c..94f6cddf941 100644
--- a/target/linux/ramips/dts/kn.dts
+++ b/target/linux/ramips/dts/kn.dts
@@ -37,7 +37,7 @@
 
 		partition@50000 {
 			label = "firmware";
-			reg = <0x50000 0x3b0000>;
+			reg = <0x50000 0x7b0000>;
 		};
 	};
 
diff --git a/target/linux/ramips/image/rt305x.mk b/target/linux/ramips/image/rt305x.mk
index 2d071c1ebc6..06231970551 100644
--- a/target/linux/ramips/image/rt305x.mk
+++ b/target/linux/ramips/image/rt305x.mk
@@ -895,7 +895,7 @@ TARGET_DEVICES += xdxrn502j
 define Device/kn
   DTS := kn
   BLOCKSIZE := 64k
-  IMAGE_SIZE := $(ralink_default_fw_size_4M)
+  IMAGE_SIZE := 7872k
   DEVICE_TITLE := ZyXEL Keenetic
   DEVICE_PACKAGES := kmod-usb-core kmod-usb2 kmod-usb-ehci kmod-usb-ledtrig-usbport
 endef