diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index b9692c5f3a..bebe40c216 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -229,30 +229,6 @@ define Build/belkin-header
 	mv $@.new $@
 endef
 
-define Build/ubnt-erx-factory-image
-	if [ -e $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE) -a "$$(stat -c%s $@)" -lt "$(KERNEL_SIZE)" ]; then \
-		echo '21001:7' > $(1).compat; \
-		$(TAR) -cf $(1) --transform='s/^.*/compat/' $(1).compat; \
-		\
-		$(TAR) -rf $(1) --transform='s/^.*/vmlinux.tmp/' $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE); \
-		$(MKHASH) md5 $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE) > $(1).md5; \
-		$(TAR) -rf $(1) --transform='s/^.*/vmlinux.tmp.md5/' $(1).md5; \
-		\
-		echo "dummy" > $(1).rootfs; \
-		$(TAR) -rf $(1) --transform='s/^.*/squashfs.tmp/' $(1).rootfs; \
-		\
-		$(MKHASH) md5 $(1).rootfs > $(1).md5; \
-		$(TAR) -rf $(1) --transform='s/^.*/squashfs.tmp.md5/' $(1).md5; \
-		\
-		echo '$(BOARD) $(VERSION_CODE) $(VERSION_NUMBER)' > $(1).version; \
-		$(TAR) -rf $(1) --transform='s/^.*/version.tmp/' $(1).version; \
-		\
-		$(CP) $(1) $(BIN_DIR)/; \
-	else \
-		echo "WARNING: initramfs kernel image too big, cannot generate factory image (actual $$(stat -c%s $@); max $(KERNEL_SIZE))" >&2; \
-	fi
-endef
-
 define Build/zytrx-header
 	$(eval board=$(word 1,$(1)))
 	$(eval version=$(word 2,$(1)))
@@ -2861,8 +2837,6 @@ define Device/ubnt_edgerouter_common
   IMAGE_SIZE := 256768k
   FILESYSTEMS := squashfs
   KERNEL_SIZE := 6144k
-  KERNEL_INITRAMFS := $$(KERNEL) | \
-	ubnt-erx-factory-image $(KDIR)/tmp/$$(KERNEL_INITRAMFS_PREFIX)-factory.tar
   IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
   DEVICE_PACKAGES += -wpad-basic-mbedtls -uboot-envtools
   DEVICE_COMPAT_VERSION := 2.0