diff --git a/_data/boards/STM32F401RCT6-STM32F-Core-Board.json b/_data/boards/STM32F401RCT6-STM32F-Core-Board.json
index 52c4cad..fcb2cf0 100644
--- a/_data/boards/STM32F401RCT6-STM32F-Core-Board.json
+++ b/_data/boards/STM32F401RCT6-STM32F-Core-Board.json
@@ -38,7 +38,8 @@
         "mounting": "None"
     },
     "remarks": [
-        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." }
+        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." },
+        { "type": "warning", "content": "This board has an external switchable (disabled by default) USB pullup (R11) which is not actually needed (since automatic internal pullups are present) and might actually be harmful (when both pullups are enabled, the USB specification is violated)." }
     ],
     "resources": [
         {
diff --git a/_data/boards/STM32F407VET6-Euse-M4-DEMO-Medium.json b/_data/boards/STM32F407VET6-Euse-M4-DEMO-Medium.json
index 260ec05..9d16e22 100644
--- a/_data/boards/STM32F407VET6-Euse-M4-DEMO-Medium.json
+++ b/_data/boards/STM32F407VET6-Euse-M4-DEMO-Medium.json
@@ -41,7 +41,8 @@
         "mounting": "4x mounting hole (M2)"
     },
     "remarks": [
-        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." }
+        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." },
+        { "type": "warning", "content": "This board has an external fixed USB pullup which is not actually needed (since automatic internal pullups are present) and might actually be harmful (when both pullups are enabled, the USB specification is violated)." }
     ],
     "resources": [
         {
diff --git a/_data/boards/STM32F407VET6-STM32-F4VE-V2.0.json b/_data/boards/STM32F407VET6-STM32-F4VE-V2.0.json
index 6c30c0b..298b725 100644
--- a/_data/boards/STM32F407VET6-STM32-F4VE-V2.0.json
+++ b/_data/boards/STM32F407VET6-STM32-F4VE-V2.0.json
@@ -38,7 +38,8 @@
         "mounting": "4x mounting hole (M3)"
     },
     "remarks": [
-        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." }
+        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." },
+        { "type": "warning", "content": "This board has an external fixed USB pullup (R21) which is not actually needed (since automatic internal pullups are present) and might actually be harmful (when both pullups are enabled, the USB specification is violated)." }
     ],
     "resources": [
         {
diff --git a/_data/boards/STM32F407VET6-VCC-GND-Small.json b/_data/boards/STM32F407VET6-VCC-GND-Small.json
index d6c99a4..fadd6d6 100644
--- a/_data/boards/STM32F407VET6-VCC-GND-Small.json
+++ b/_data/boards/STM32F407VET6-VCC-GND-Small.json
@@ -38,7 +38,8 @@
         "mounting": "None"
     },
     "remarks": [
-        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." }
+        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." },
+        { "type": "warning", "content": "This board has an external fixed USB pullup (R21) which is not actually needed (since automatic internal pullups are present) and might actually be harmful (when both pullups are enabled, the USB specification is violated)." }
     ],
     "resources": [
         {
diff --git a/_data/boards/STM32F407VGT6-SR-Board.json b/_data/boards/STM32F407VGT6-SR-Board.json
index d612ffc..900ceee 100644
--- a/_data/boards/STM32F407VGT6-SR-Board.json
+++ b/_data/boards/STM32F407VGT6-SR-Board.json
@@ -35,7 +35,8 @@
         "mounting": "None"
     },
     "remarks": [
-        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." }
+        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." },
+        { "type": "warning", "content": "This board has an external fixed USB pullup (R8) which is not actually needed (since automatic internal pullups are present) and might actually be harmful (when both pullups are enabled, the USB specification is violated)." }
     ],
     "resources": [
         {
diff --git a/_data/boards/STM32F407ZGT6-STM32F-Core-Board.json b/_data/boards/STM32F407ZGT6-STM32F-Core-Board.json
index 4ee0c75..2934b65 100644
--- a/_data/boards/STM32F407ZGT6-STM32F-Core-Board.json
+++ b/_data/boards/STM32F407ZGT6-STM32F-Core-Board.json
@@ -38,7 +38,8 @@
         "mounting": "None"
     },
     "remarks": [
-        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." }
+        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." },
+        { "type": "warning", "content": "This board has an external switchable (disabled by default) USB pullup (R14) which is not actually needed (since automatic internal pullups are present) and might actually be harmful (when both pullups are enabled, the USB specification is violated)." }
     ],
     "resources": [
         {
diff --git a/_data/boards/STM32F407ZGT6-VCC-GND-Large.json b/_data/boards/STM32F407ZGT6-VCC-GND-Large.json
index 5265733..967373f 100644
--- a/_data/boards/STM32F407ZGT6-VCC-GND-Large.json
+++ b/_data/boards/STM32F407ZGT6-VCC-GND-Large.json
@@ -38,7 +38,8 @@
         "mounting": "None"
     },
     "remarks": [
-        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." }
+        { "type": "warning", "content": "The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time." },
+        { "type": "warning", "content": "This board has an external fixed USB pullup (R8) which is not actually needed (since automatic internal pullups are present) and might actually be harmful (when both pullups are enabled, the USB specification is violated)." }
     ],
     "resources": [
         {