diff --git a/flashchips.c b/flashchips.c
index 8065283..bbd5cad 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -15550,6 +15550,53 @@
 
 	{
 		.vendor		= "Winbond",
+		.name		= "W25Q256JV_M",
+		.bustype	= BUS_SPI,
+		.manufacture_id	= WINBOND_NEX_ID,
+		.model_id	= WINBOND_NEX_W25Q256JV_M,
+		.total_size	= 32768,
+		.page_size	= 256,
+		/* supports SFDP */
+		/* OTP: 1024B total, 256B reserved; read 0x48; write 0x42, erase 0x44, read ID 0x4B */
+		/* FOUR_BYTE_ADDR: supports 4-bytes addressing mode */
+		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA,
+		.tested		= TEST_OK_PREW,
+		.probe		= probe_spi_rdid,
+		.probe_timing	= TIMING_ZERO,
+		.block_erasers	=
+		{
+			{
+				.eraseblocks = { {4 * 1024, 8192} },
+				.block_erase = spi_block_erase_21,
+			}, {
+				.eraseblocks = { {4 * 1024, 8192} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 1024} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 512} },
+				.block_erase = spi_block_erase_dc,
+			}, {
+				.eraseblocks = { {64 * 1024, 512} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {32 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {32 * 1024 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
+		.printlock	= spi_prettyprint_status_register_plain, /* TODO: improve */
+		.unlock		= spi_disable_blockprotect,
+		.write		= spi_chip_write_256,
+		.read		= spi_chip_read,
+		.voltage	= {2700, 3600},
+	},
+
+	{
+		.vendor		= "Winbond",
 		.name		= "W25Q20.W",
 		.bustype	= BUS_SPI,
 		.manufacture_id	= WINBOND_NEX_ID,
diff --git a/flashchips.h b/flashchips.h
index 218cb5b..429acef 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -916,7 +916,7 @@
 #define WINBOND_NEX_W25Q32_V	0x4016	/* W25Q32BV; W25Q32FV in SPI mode (default) */
 #define WINBOND_NEX_W25Q64_V	0x4017	/* W25Q64BV, W25Q64CV; W25Q64FV in SPI mode (default) */
 #define WINBOND_NEX_W25Q128_V	0x4018	/* W25Q128BV; W25Q128FV in SPI mode (default) */
-#define WINBOND_NEX_W25Q256_V	0x4019	/* W25Q256FV */
+#define WINBOND_NEX_W25Q256_V	0x4019	/* W25Q256FV or W25Q256JV_Q (QE=1) */
 #define WINBOND_NEX_W25Q20_W	0x5012	/* W25Q20BW */
 #define WINBOND_NEX_W25Q40BW	0x5013	/* W25Q40BW */
 #define WINBOND_NEX_W25Q80BW	0x5014	/* W25Q80BW */
@@ -927,6 +927,7 @@
 #define WINBOND_NEX_W25Q64_W	0x6017	/* W25Q64DW; W25Q64FV in QPI mode */
 #define WINBOND_NEX_W25Q128_W	0x6018	/* W25Q128FW; W25Q128FV in QPI mode */
 #define WINBOND_NEX_W25Q128_V_M	0x7018	/* W25Q128JVSM */
+#define WINBOND_NEX_W25Q256JV_M	0x7019	/* W25Q256JV_M (QE=0) */
 
 #define WINBOND_ID		0xDA	/* Winbond */
 #define WINBOND_W19B160BB	0x49