diff --git a/target/linux/realtek/dts/rtl8380_zyxel_gs1900.dtsi b/target/linux/realtek/dts/rtl8380_zyxel_gs1900.dtsi
index 5993c1b798d..b985c4bc8e4 100644
--- a/target/linux/realtek/dts/rtl8380_zyxel_gs1900.dtsi
+++ b/target/linux/realtek/dts/rtl8380_zyxel_gs1900.dtsi
@@ -91,14 +91,10 @@
 			};
 			partition@b260000 {
 				label = "firmware";
-				reg = <0x260000 0x6d0000>;
+				reg = <0x260000 0xda0000>;
 				compatible = "openwrt,uimage", "denx,uimage";
 				openwrt,ih-magic = <0x83800000>;
 			};
-			partition@930000 {
-				label = "runtime2";
-				reg = <0x930000 0x6d0000>;
-			};
 		};
 	};
 };
diff --git a/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48.dts b/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48.dts
index f049274889a..9844dc2180f 100644
--- a/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48.dts
+++ b/target/linux/realtek/dts/rtl8393_zyxel_gs1900-48.dts
@@ -126,14 +126,10 @@
 			};
 			partition@260000 {
 				label = "firmware";
-				reg = <0x260000 0x6d0000>;
+				reg = <0x260000 0xda0000>;
 				compatible = "openwrt,uimage", "denx,uimage";
 				openwrt,ih-magic = <0x83800000>;
 			};
-			partition@930000 {
-				label = "runtime2";
-				reg = <0x930000 0x6d0000>;
-			};
 		};
 	};
 };
diff --git a/target/linux/realtek/image/common.mk b/target/linux/realtek/image/common.mk
index 27fcea86ece..d9647dbc072 100644
--- a/target/linux/realtek/image/common.mk
+++ b/target/linux/realtek/image/common.mk
@@ -57,13 +57,17 @@ define Device/hpe_1920
 endef
 
 define Device/zyxel_gs1900
+  DEVICE_COMPAT_VERSION := 2.0
+  DEVICE_COMPAT_MESSAGE := Dual firmware paritition merged due to size constraints. \
+	Upgrade requires a new factory install. Regular sysupgrade is not possible.
   DEVICE_VENDOR := Zyxel
-  IMAGE_SIZE := 6976k
+  IMAGE_SIZE := 13952k
   UIMAGE_MAGIC := 0x83800000
   KERNEL_INITRAMFS := \
 	kernel-bin | \
 	append-dtb | \
 	libdeflate-gzip | \
 	zyxel-vers | \
-	uImage gzip
+	uImage gzip | \
+	check-size 6976k
 endef