diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 98d83f9..20dff49 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -499,6 +499,7 @@ TARGET_DEVICES += mikrotik_rb750gr3
 define Device/mikrotik_rbm11g
   $(Device/MikroTik)
   DEVICE_MODEL := RouterBOARD M11G
+  BLOCKSIZE := 64k
 endef
 TARGET_DEVICES += mikrotik_rbm11g
 
diff --git a/target/linux/ramips/mt7621/target.mk b/target/linux/ramips/mt7621/target.mk
index c2eba1d..91fc4f1 100644
--- a/target/linux/ramips/mt7621/target.mk
+++ b/target/linux/ramips/mt7621/target.mk
@@ -4,7 +4,7 @@
 
 SUBTARGET:=mt7621
 BOARDNAME:=MT7621 based boards
-FEATURES+=nand ramdisk rtc usb minor
+FEATURES+=nand ramdisk rtc usb minor jffs2
 CPU_TYPE:=24kc
 
 define Target/Description
diff --git a/target/linux/ramips/patches-4.14/9999-fix-jffs2.patch b/target/linux/ramips/patches-4.14/9999-fix-jffs2.patch
new file mode 100644
index 0000000..5c8a254
--- /dev/null
+++ b/target/linux/ramips/patches-4.14/9999-fix-jffs2.patch
@@ -0,0 +1,15 @@
+Index: linux-4.14.172/drivers/mtd/mtdsplit/mtdsplit.c
+===================================================================
+--- linux-4.14.172.orig/drivers/mtd/mtdsplit/mtdsplit.c
++++ linux-4.14.172/drivers/mtd/mtdsplit/mtdsplit.c
+@@ -95,6 +95,10 @@ int mtd_check_rootfs_magic(struct mtd_in
+ 		if (type)
+ 			*type = MTDSPLIT_PART_TYPE_JFFS2;
+ 		return 0;
++	} else if (magic == 0x20031985) {
++		if (type)
++			*type = MTDSPLIT_PART_TYPE_JFFS2;
++		return 0;
+ 	} else if (be32_to_cpu(magic) == UBI_EC_MAGIC) {
+ 		if (type)
+ 			*type = MTDSPLIT_PART_TYPE_UBI;