diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index ceed8ab4f1..0c14d515d0 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -57,7 +57,7 @@ TARGET_DEVICES += wsr-1166
 
 define Device/dir-860l-b1
   DTS := DIR-860L-B1
-  BLOCKSIZE := 4k
+  BLOCKSIZE := 64k
   IMAGES += factory.bin
   KERNEL := kernel-bin | patch-dtb | relocate-kernel | lzma | uImage lzma
   IMAGE_SIZE := $(ralink_default_fw_size_16M)
diff --git a/target/linux/ramips/image/rt305x.mk b/target/linux/ramips/image/rt305x.mk
index 13193ae796..be21ac47b9 100644
--- a/target/linux/ramips/image/rt305x.mk
+++ b/target/linux/ramips/image/rt305x.mk
@@ -432,7 +432,7 @@ TARGET_DEVICES += wcr150gn
 
 define Device/mzk-dp150n
   DTS := MZK-DP150N
-  BLOCKSIZE := 4k
+  BLOCKSIZE := 64k
   IMAGE_SIZE := $(ralink_default_fw_size_4M)
   DEVICE_TITLE := Planex MZK-DP150N
   DEVICE_PACKAGES := kmod-spi-dev
diff --git a/target/linux/ramips/mt7621/config-4.4 b/target/linux/ramips/mt7621/config-4.4
index b391005a31..9132d894df 100644
--- a/target/linux/ramips/mt7621/config-4.4
+++ b/target/linux/ramips/mt7621/config-4.4
@@ -159,7 +159,6 @@ CONFIG_MTD_NAND=y
 CONFIG_MTD_NAND_ECC=y
 CONFIG_MTD_PHYSMAP=y
 CONFIG_MTD_SPI_NOR=y
-CONFIG_MTD_SPI_NOR_USE_4K_SECTORS=y
 CONFIG_MTD_SPLIT_FIRMWARE=y
 CONFIG_MTD_SPLIT_SEAMA_FW=y
 CONFIG_MTD_SPLIT_TRX_FW=y