diff --git a/F3:F303/Multistepper/hardware.c b/F3:F303/Multistepper/hardware.c
index 436fc12..940d6e0 100644
--- a/F3:F303/Multistepper/hardware.c
+++ b/F3:F303/Multistepper/hardware.c
@@ -114,7 +114,7 @@ TRUE_INLINE void gpio_setup(){
     GPIOA->OSPEEDR = OSPEED_MED(5) | OSPEED_MED(6) | OSPEED_MED(7) | OSPEED_HI(11) | OSPEED_HI(12)
                  | OSPEED_HI(13) | OSPEED_HI(15);
     GPIOA->OTYPER = 0;
-    GPIOA->PUPDR = PUPD_PU(8) | PUPD_PU(9) | PUPD_PU(10);
+    GPIOA->PUPDR = PUPD_PU(9) | PUPD_PU(10);
 
     GPIOB->ODR = 0;
     GPIOB->AFR[0] = AFRf(2, 0) | AFRf(7, 3) | AFRf(10, 5);
@@ -125,7 +125,7 @@ TRUE_INLINE void gpio_setup(){
     GPIOB->OSPEEDR = OSPEED_HI(0) | OSPEED_HI(5) | OSPEED_HI(8) | OSPEED_MED(13) | OSPEED_MED(14) | OSPEED_MED(15);
     // USART2_Tx (PB3) and USART3_Tx (PB10) are pullup opendrain
     GPIOB->OTYPER = OTYPER_OD(3) | OTYPER_OD(10);
-    GPIOB->PUPDR = PUPD_PU(3) | PUPD_PU(7) | PUPD_PU(9) | PUPD_PU(7) | PUPD_PU(11);
+    GPIOB->PUPDR = PUPD_PU(3) | PUPD_PU(7) | PUPD_PU(9) | PUPD_PU(10) | PUPD_PU(11);
 
     GPIOC->ODR = 0;
     GPIOC->AFR[0] = AFRf(7, 4) | AFRf(7, 5) | AFRf(4, 6);
diff --git a/F3:F303/Multistepper/hardware.h b/F3:F303/Multistepper/hardware.h
index 41fb937..3a8c815 100644
--- a/F3:F303/Multistepper/hardware.h
+++ b/F3:F303/Multistepper/hardware.h
@@ -34,10 +34,12 @@
 // USB pullup: PA8
 #define USBPU_port  GPIOA
 #define USBPU_pin   (1<<8)
-//#define USBPU_ON()  pin_clear(USBPU_port, USBPU_pin)
-//#define USBPU_OFF() pin_set(USBPU_port, USBPU_pin)
-#define USBPU_ON()  pin_set(USBPU_port, USBPU_pin)
-#define USBPU_OFF() pin_clear(USBPU_port, USBPU_pin)
+// Pullup by P-channel MOSFET
+#define USBPU_ON()  pin_clear(USBPU_port, USBPU_pin)
+#define USBPU_OFF() pin_set(USBPU_port, USBPU_pin)
+// direct pullup connected to pin
+//#define USBPU_ON()  pin_set(USBPU_port, USBPU_pin)
+//#define USBPU_OFF() pin_clear(USBPU_port, USBPU_pin)
 
 // temporary LED: PD9
 #define LED_blink() pin_toggle(GPIOD, 1<<9)
diff --git a/F3:F303/Multistepper/multistepper.bin b/F3:F303/Multistepper/multistepper.bin
index 5ed070a..2830ca3 100755
Binary files a/F3:F303/Multistepper/multistepper.bin and b/F3:F303/Multistepper/multistepper.bin differ
diff --git a/F3:F303/Multistepper/version.inc b/F3:F303/Multistepper/version.inc
index 79833d0..84585f2 100644
--- a/F3:F303/Multistepper/version.inc
+++ b/F3:F303/Multistepper/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "104"
-#define BUILD_DATE "2023-03-02"
+#define BUILD_NUMBER "107"
+#define BUILD_DATE "2024-08-15"
diff --git a/F3:F303/inc/ld/stm32f303xB.ld b/F3:F303/inc/ld/stm32f303xB.ld
index 15b95fa..ae9c8be 100644
--- a/F3:F303/inc/ld/stm32f303xB.ld
+++ b/F3:F303/inc/ld/stm32f303xB.ld
@@ -5,5 +5,7 @@ MEMORY
 	ccmram (rwx) : ORIGIN = 0x10000000, LENGTH = 8K
 }
 
+PROVIDE(_BLOCKSIZE = 2048);
+
 /* Include the common ld script. */
 INCLUDE stm32f3.ld
diff --git a/F3:F303/inc/ld/stm32f303xD.ld b/F3:F303/inc/ld/stm32f303xD.ld
index 2022fdd..298e233 100644
--- a/F3:F303/inc/ld/stm32f303xD.ld
+++ b/F3:F303/inc/ld/stm32f303xD.ld
@@ -5,5 +5,7 @@ MEMORY
 	ccmram (rwx) : ORIGIN = 0x10000000, LENGTH = 16K
 }
 
+PROVIDE(_BLOCKSIZE = 2048);
+
 /* Include the common ld script. */
 INCLUDE stm32f3.ld