diff --git a/stm32flash.patches/stm32flash-50.patch b/stm32flash.patches/stm32flash-50.patch
new file mode 100644
index 0000000..e0f95ba
--- /dev/null
+++ b/stm32flash.patches/stm32flash-50.patch
@@ -0,0 +1,86 @@
+diff -aruN stm32flash.orig/dev_table.c stm32flash/dev_table.c
+--- stm32flash.orig/dev_table.c	2014-10-03 14:35:08.000000000 -0700
++++ stm32flash/dev_table.c	2015-02-02 17:25:20.752854394 -0800
+@@ -57,9 +57,10 @@
+ 	/* L0 */
+ 	{0x417, "L05xxx/06xxx"      , 0x20001000, 0x20002000, 0x08000000, 0x08010000, 32,  128, 0x1FF80000, 0x1FF8000F, 0x1FF00000, 0x1FF01000},
+ 	/* L1 */
+-	{0x416, "L1xxx6(8/B)"       , 0x20000800, 0x20004000, 0x08000000, 0x08020000, 16,  256, 0x1FF80000, 0x1FF8000F, 0x1FF00000, 0x1FF01000},
+-	{0x429, "L1xxx6(8/B)A"      , 0x20001000, 0x20008000, 0x08000000, 0x08020000, 16,  256, 0x1FF80000, 0x1FF8000F, 0x1FF00000, 0x1FF01000},
+-	{0x427, "L1xxxC"            , 0x20001000, 0x20008000, 0x08000000, 0x08020000, 16,  256, 0x1FF80000, 0x1FF8000F, 0x1FF00000, 0x1FF02000},
++	{0x416, "Medium-density ULP", 0x20000800, 0x20004000, 0x08000000, 0x08020000, 16,  256, 0x1FF80000, 0x1FF8000F, 0x1FF00000, 0x1FF01000},
++	{0x429, "Medium-density ULP Shrink", 0x20000800, 0x20004000, 0x08000000, 0x08020000, 16,  256, 0x1FF80000, 0x1FF8000F, 0x1FF00000, 0x1FF01000},
++	{0x427, "Medium+-density ULP", 0x20001000, 0x20008000, 0x08000000, 0x08040000, 16,  256, 0x1FF80000, 0x1FF8000F, 0x1FF00000, 0x1FF01000},
++
+ 	{0x436, "L1xxxD"            , 0x20001000, 0x2000C000, 0x08000000, 0x08060000, 16,  256, 0x1ff80000, 0x1ff8000F, 0x1FF00000, 0x1FF02000},
+ 	{0x437, "L1xxxE"            , 0x20001000, 0x20014000, 0x08000000, 0x08060000, 16,  256, 0x1ff80000, 0x1ff8000F, 0x1FF00000, 0x1FF02000},
+ 	/* These are not (yet) in AN2606: */
+diff -aruN stm32flash.orig/stm32.c stm32flash/stm32.c
+--- stm32flash.orig/stm32.c	2014-10-02 00:20:26.000000000 -0700
++++ stm32flash/stm32.c	2015-02-02 17:25:20.752854394 -0800
+@@ -96,6 +96,7 @@
+ static const uint32_t stm_reset_code_length = sizeof(stm_reset_code);
+ 
+ extern const stm32_dev_t devices[];
++extern char	reset_flag;
+ 
+ static void stm32_warn_stretching(const char *f)
+ {
+@@ -698,7 +699,16 @@
+ 	return STM32_ERR_OK;
+ }
+ 
+-stm32_err_t stm32_erase_memory(const stm32_t *stm, uint8_t spage, uint8_t pages)
++int supports_mass_erase(uint16_t chip_id)
++{
++	int retval = 1;
++	if(chip_id == 0x416 || chip_id == 0x417 || chip_id == 0x427 || chip_id == 0x429) {
++		retval = 0;
++	}
++	return retval;
++}
++
++stm32_err_t stm32_erase_memory(const stm32_t *stm, uint16_t spage, uint16_t pages)
+ {
+ 	struct port_interface *port = stm->port;
+ 	stm32_err_t s_err;
+@@ -725,8 +735,11 @@
+ 		/* Currently known as not supporting mass erase is the Ultra Low Power STM32L15xx range */
+ 		/* So if someone has not overridden the default, but uses one of these chips, take it out of */
+ 		/* mass erase mode, so it will be done page by page. This maximum might not be correct either! */
+-		if (stm->pid == 0x416 && pages == 0xFF)
++
++		if (!supports_mass_erase(stm->pid) && pages == 0xFF) {
+ 			pages = 0xF8; /* works for the STM32L152RB with 128Kb flash */
++			reset_flag	= 1; /* To mimic earlier behavior*/
++		}
+ 
+ 		if (pages == 0xFF) {
+ 			uint8_t buf[3];
+@@ -756,6 +769,12 @@
+ 		uint8_t *buf;
+ 		int i = 0;
+ 
++		if (pages == 0xF8) {
++			/* Erase the whole flash */
++			pages = (stm->dev->fl_end - stm->dev->fl_start) / stm->dev->fl_ps;
++			fprintf(stderr, "Erase 0x%x pages\n", pages);
++		}
++
+ 		buf = malloc(2 + 2 * pages + 1);
+ 		if (!buf)
+ 			return STM32_ERR_UNKNOWN;
+diff -aruN stm32flash.orig/stm32.h stm32flash/stm32.h
+--- stm32flash.orig/stm32.h	2014-10-02 00:20:26.000000000 -0700
++++ stm32flash/stm32.h	2015-02-02 17:25:20.752854394 -0800
+@@ -68,8 +68,8 @@
+ 			       const uint8_t data[], unsigned int len);
+ stm32_err_t stm32_wunprot_memory(const stm32_t *stm);
+ stm32_err_t stm32_wprot_memory(const stm32_t *stm);
+-stm32_err_t stm32_erase_memory(const stm32_t *stm, uint8_t spage,
+-			       uint8_t pages);
++stm32_err_t stm32_erase_memory(const stm32_t *stm, uint16_t spage,
++			       uint16_t pages);
+ stm32_err_t stm32_go(const stm32_t *stm, uint32_t address);
+ stm32_err_t stm32_reset_device(const stm32_t *stm);
+ stm32_err_t stm32_readprot_memory(const stm32_t *stm);
diff --git a/stm32flash.patches/stm32flash-51.patch b/stm32flash.patches/stm32flash-51.patch
new file mode 100644
index 0000000..b09b2e2
--- /dev/null
+++ b/stm32flash.patches/stm32flash-51.patch
@@ -0,0 +1,24 @@
+diff -aruN stm32flash/dev_table.c stm32flash_l4/dev_table.c
+--- stm32flash/dev_table.c	2016-03-08 10:55:19.183518329 -0800
++++ stm32flash_l4/dev_table.c	2016-03-04 14:19:45.997712775 -0800
+@@ -67,5 +67,7 @@
+ 	{0x641, "Medium_Density PL" , 0x20000200, 0x00005000, 0x08000000, 0x08020000,  4, 1024, 0x1FFFF800, 0x1FFFF80F, 0x1FFFF000, 0x1FFFF800},
+ 	{0x9a8, "STM32W-128K"       , 0x20000200, 0x20002000, 0x08000000, 0x08020000,  1, 1024, 0, 0, 0, 0},
+ 	{0x9b0, "STM32W-256K"       , 0x20000200, 0x20004000, 0x08000000, 0x08040000,  1, 2048, 0, 0, 0, 0},
++	/* STML431/33 */
++	{0x435, "L43xxC"            , 0x20003100, 0x20010000, 0x08000000, 0x08040000, 64, 2048, 0x1FFF7800, 0x1FFF7810, 0x1FFF0000, 0x1FFf7000},
+ 	{0x0}
+ };
+diff -aruN stm32flash/stm32.c stm32flash_l4/stm32.c
+--- stm32flash/stm32.c	2016-03-08 10:55:19.183518329 -0800
++++ stm32flash_l4/stm32.c	2016-03-08 10:59:00.776754091 -0800
+@@ -702,7 +702,8 @@
+ int supports_mass_erase(uint16_t chip_id)
+ {
+ 	int retval = 1;
+-	if(chip_id == 0x416 || chip_id == 0x417 || chip_id == 0x427 || chip_id == 0x429) {
++	if(chip_id == 0x416 || chip_id == 0x417 || chip_id == 0x427 || chip_id == 0x429
++                || chip_id == 0x435) {
+ 		retval = 0;
+ 	}
+ 	return retval;
diff --git a/stm32flash.patches/stm32flash-52.patch b/stm32flash.patches/stm32flash-52.patch
new file mode 100644
index 0000000..52b3bc8
--- /dev/null
+++ b/stm32flash.patches/stm32flash-52.patch
@@ -0,0 +1,53 @@
+diff -aruN stm32flash/stm32.c stm32flash_new/stm32.c
+--- stm32flash/stm32.c	2016-06-01 14:08:24.915895726 -0700
++++ stm32flash_new/stm32.c	2016-06-01 14:17:48.097561748 -0700
+@@ -93,6 +93,26 @@
+ 	0x04, 0x00, 0xfa, 0x05	// .word 0x05fa0004 <AIRCR_RESET_VALUE> = VECTKEY | SYSRESETREQ
+ };
+ 
++/* Workaround for L433VC part, check the PEMPTY bit(0x20000) in FLASH_SR register, if it is set
++   clear it via writing 0x20000 to FLASH_SR so target will boot from flash on next reset */
++static const uint8_t stml433vc_reset_code[] = {
++    0x07, 0x4B,     // ldr   r3 0x20003128        0x20003108  load FLASH_SR_ADDRESS to r3
++    0x18, 0x68,     // ldr   r0, [r3]             0x2000310a  load FLASH_SR reg to r0
++    0x80, 0x22,     // movs  r2, #128             0x2000310c  load 0x20000 to r2
++    0x92, 0x02,     // lsls  r2, r2, #10          0x2000310e
++    0x10, 0x40,     // ands  r0 r2                0x20003110  check 0x20000 in FLASH_SR reg
++    0x00, 0xd0,     // beq   0x20003116           0x20003112  if 0x20000 is set, set it again
++    0x1a, 0x60,     // str   r2, [r3, #0]         0x20003114
++    0x02, 0x49,     // ldr   r1, 0x20003120 ;     0x20003116  perform system reset via AIRCR
++    0x02, 0x4A,     // ldr   r2, 0x20003124 ;     0x20003118
++    0x0A, 0x60,     // str   r2, [r1]             0x2000311a
++    0xfe, 0xe7,     // endless: b endless         0x2000311c
++    0x00, 0xbf,     // nop                        0x2000311e
++    0x0c, 0xed, 0x00, 0xe0, // .word 0xe000ed0c <AIRCR_OFFSET> = NVIC AIRCR register address  0x20003120
++    0x04, 0x00, 0xfa, 0x05, // .word 0x05fa0004 <AIRCR_RESET_VALUE> = VECTKEY | SYSRESETREQ   0x20003124
++    0x10, 0x20, 0x02, 0x40, // .word 0x40022010 FLASH_SR_ADDRESS                              0x20003128
++};
++
+ static const uint32_t stm_reset_code_length = sizeof(stm_reset_code);
+ 
+ extern const stm32_dev_t devices[];
+@@ -863,7 +883,9 @@
+ 				      const uint8_t *code, uint32_t code_size)
+ {
+ 	uint32_t stack_le = le_u32(0x20002000);
+-	uint32_t code_address_le = le_u32(target_address + 8);
++	/* Need to add 1 to target address to indicate thumb mode
++	   because GO cmd uses BLX instruction to perform jump*/
++	uint32_t code_address_le = le_u32(target_address + 8 + 1);
+ 	uint32_t length = code_size + 8;
+ 	uint8_t *mem, *pos;
+ 	uint32_t address, w;
+@@ -930,7 +952,10 @@
+ {
+ 	uint32_t target_address = stm->dev->ram_start;
+ 
+-	return stm32_run_raw_code(stm, target_address, stm_reset_code, stm_reset_code_length);
++    if (stm->dev->id == 0x435)
++        return stm32_run_raw_code(stm, target_address, stml433vc_reset_code, sizeof(stml433vc_reset_code));
++    else
++        return stm32_run_raw_code(stm, target_address, stm_reset_code, stm_reset_code_length);
+ }
+ 
+ stm32_err_t stm32_crc_memory(const stm32_t *stm, uint32_t address,
diff --git a/stm32flash.patches/stm32flash-53.patch b/stm32flash.patches/stm32flash-53.patch
new file mode 100644
index 0000000..0e65cc4
--- /dev/null
+++ b/stm32flash.patches/stm32flash-53.patch
@@ -0,0 +1,11 @@
+--- stm32flash/dev_table.c	2017-08-15 12:43:44.727882771 -0700
++++ stm32flash_new/dev_table.c	2017-08-29 10:08:16.700715014 -0700
+@@ -69,5 +69,8 @@
+ 	{0x9b0, "STM32W-256K"       , 0x20000200, 0x20004000, 0x08000000, 0x08040000,  1, 2048, 0, 0, 0, 0},
+ 	/* STML431/33 */
+ 	{0x435, "L43xxC"            , 0x20003100, 0x20010000, 0x08000000, 0x08040000, 64, 2048, 0x1FFF7800, 0x1FFF7810, 0x1FFF0000, 0x1FFf7000},
++	/* L4 */
++	{0x415, "STM32L476xx/486xx" , 0x20003100, 0x20018000, 0x08000000, 0x08100000,  1, 2048, 0x1FFF7800, 0x1FFFF80F, 0x1FFF0000, 0x1FFF7000, 0}, 
++	{0x435, "STM32L43xxx/44xxx" , 0x20003100, 0x2000C000, 0x08000000, 0x08100000,  1, 2048, 0x1FFF7800, 0x1FFFF80F, 0x1FFF0000, 0x1FFF7000, 0},	
+ 	{0x0}
+ };
diff --git a/stm32flash.tar.gz b/stm32flash.tar.gz
new file mode 100644
index 0000000..b7ff44f
--- /dev/null
+++ b/stm32flash.tar.gz
Binary files differ
diff --git a/stm32flash.url b/stm32flash.url
new file mode 100644
index 0000000..deed025
--- /dev/null
+++ b/stm32flash.url
@@ -0,0 +1 @@
+http://releases.stm32flash.googlecode.com/git/stm32flash-0.4.tar.gz
diff --git a/stm32flash.version b/stm32flash.version
new file mode 100644
index 0000000..bd73f47
--- /dev/null
+++ b/stm32flash.version
@@ -0,0 +1 @@
+0.4