diff --git a/README.md b/README.md
index c20040c..178e081 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,12 @@ If you're not running Linux or OSX natively, you can use
 
 ### Change Log
 
+#### v1.2
+
+* Added a new CLI command: `gpio`. This command allows one to control the SMD GPIO pads via USB/UART.
+* [Fixed handling of zero-length USB transactions](http://www.chibios.com/forum/viewtopic.php?f=25&t=4568&p=32429).
+* Fixed naming of software version fields in the bootloader: `fw_` --> `sw_`.
+
 #### v1.1
 
 * CAN terminator is turned ON by default.
diff --git a/bootloader/Makefile b/bootloader/Makefile
index b1d287a..9adfbd8 100644
--- a/bootloader/Makefile
+++ b/bootloader/Makefile
@@ -21,7 +21,7 @@ PROJECT = com.zubax.babel
 
 HW_VERSION = 1
 BL_VERSION_MAJOR = 1
-BL_VERSION_MINOR = 0
+BL_VERSION_MINOR = 1
 
 APPLICATION_OFFSET = 32768
 
diff --git a/bootloader/src/cli.cpp b/bootloader/src/cli.cpp
index fc2f9d5..f7ce71b 100644
--- a/bootloader/src/cli.cpp
+++ b/bootloader/src/cli.cpp
@@ -92,8 +92,8 @@ class ZubaxIDCommand : public os::shell::ICommandHandler
         if (appinfo.second)
         {
             const auto& inf = appinfo.first;
-            ios.print("fw_version   : '%u.%u'\n", inf.major_version, inf.minor_version);
-            ios.print("fw_vcs_commit: %u\n", inf.vcs_commit);
+            ios.print("sw_version   : '%u.%u'\n", inf.major_version, inf.minor_version);
+            ios.print("sw_vcs_commit: %u\n", inf.vcs_commit);
         }
     }
 } static cmd_zubax_id;
diff --git a/bootloader/src/usb_cdc.cpp b/bootloader/src/usb_cdc.cpp
index d28f15d..b09cc0d 100644
--- a/bootloader/src/usb_cdc.cpp
+++ b/bootloader/src/usb_cdc.cpp
@@ -242,6 +242,22 @@ static const USBDescriptor *get_descriptor(USBDriver *usbp, uint8_t dtype, uint8
     return NULL;
 }
 
+/*
+ * USB stack crash workaround.
+ * See http://www.chibios.com/forum/viewtopic.php?f=25&t=4568&p=32429
+ * This bug is fixed in ChibiOS 18+, so the workaround does not have to be here after the OS is updated.
+ */
+static void sduDataReceivedProxy(USBDriver* const usbp, const usbep_t ep)
+{
+    if (auto sdup = static_cast<SerialUSBDriver*>(usbp->out_params[ep - 1U]))
+    {
+        if (usbGetReceiveTransactionSizeX(sdup->config->usbp, sdup->config->bulk_out) > 0)
+        {
+            sduDataReceived(usbp, ep);
+        }
+    }
+}
+
 /*
  * USB endpoints
  */
@@ -267,7 +283,7 @@ static const USBEndpointConfig ep2config =      ///< EP1 initialization structur
     USB_EP_MODE_TYPE_BULK,
     NULL,
     sduDataTransmitted,
-    sduDataReceived,
+    sduDataReceivedProxy,
     0x0040,
     0x0040,
     &ep2instate,
diff --git a/firmware/src/board/board.cpp b/firmware/src/board/board.cpp
index 6116a96..77d5c2c 100644
--- a/firmware/src/board/board.cpp
+++ b/firmware/src/board/board.cpp
@@ -171,23 +171,23 @@ void restart()
 
 void setStatusLED(bool state)
 {
-    palWritePad(GPIOE, GPIOE_LED_STATUS, !state);
+    palWritePad(GPIOE, GPIOE_LED_STATUS, std::uint8_t(!state));
 }
 
 void setTrafficLED(bool state)
 {
-    palWritePad(GPIOE, GPIOE_LED_TRAFFIC, !state);
+    palWritePad(GPIOE, GPIOE_LED_TRAFFIC, std::uint8_t(!state));
 }
 
 void enableCANPower(bool state)
 {
-    palWritePad(GPIOA, GPIOA_CAN_POWER_DIS, !state);
-    palWritePad(GPIOB, GPIOB_LED_CAN_POWER_DIS, !state);
+    palWritePad(GPIOA, GPIOA_CAN_POWER_DIS, std::uint8_t(!state));
+    palWritePad(GPIOB, GPIOB_LED_CAN_POWER_DIS, std::uint8_t(!state));
 }
 
 void enableCANTerminator(bool state)
 {
-    palWritePad(GPIOB, GPIOB_CAN_TERMINATOR_EN, state);
+    palWritePad(GPIOB, GPIOB_CAN_TERMINATOR_EN, std::uint8_t(state));
 }
 
 float getBusVoltage()
diff --git a/firmware/src/usb_cdc.cpp b/firmware/src/usb_cdc.cpp
index 434624d..3ec897a 100644
--- a/firmware/src/usb_cdc.cpp
+++ b/firmware/src/usb_cdc.cpp
@@ -240,6 +240,22 @@ static const USBDescriptor *get_descriptor(USBDriver *usbp, uint8_t dtype, uint8
     return NULL;
 }
 
+/*
+ * USB stack crash workaround.
+ * See http://www.chibios.com/forum/viewtopic.php?f=25&t=4568&p=32429
+ * This bug is fixed in ChibiOS 18+, so the workaround does not have to be here after the OS is updated.
+ */
+static void sduDataReceivedProxy(USBDriver* const usbp, const usbep_t ep)
+{
+    if (auto sdup = static_cast<SerialUSBDriver*>(usbp->out_params[ep - 1U]))
+    {
+        if (usbGetReceiveTransactionSizeX(sdup->config->usbp, sdup->config->bulk_out) > 0)
+        {
+            sduDataReceived(usbp, ep);
+        }
+    }
+}
+
 /*
  * USB endpoints
  */
@@ -265,7 +281,7 @@ static const USBEndpointConfig ep2config =      ///< EP1 initialization structur
     USB_EP_MODE_TYPE_BULK,
     NULL,
     sduDataTransmitted,
-    sduDataReceived,
+    sduDataReceivedProxy,
     0x0040,
     0x0040,
     &ep2instate,
@@ -299,7 +315,7 @@ static void usb_event(USBDriver* usbp, usbevent_t event)
         chSysLockFromISR();
 
         /*
-         * Enables the endpoints specified into the configuration.
+         * Enables the endpoints specified in the configuration.
          * Note, this callback is invoked from an ISR so I-Class functions
          * must be used.
          */