diff --git a/src/main.c b/src/main.c
index 0c407d7..96b9994 100644
--- a/src/main.c
+++ b/src/main.c
@@ -603,6 +603,9 @@ static int h5_open(struct device *unused)
 	uart_irq_rx_disable(hci_uart_dev);
 	uart_irq_tx_disable(hci_uart_dev);
 
+	/* Enable HFXO so that UART clock is stable for 115200 bitrate */
+	*(uint32_t *)0x40000000 = 0x1;
+
 	bt_uart_drain(hci_uart_dev);
 
 	uart_irq_callback_set(hci_uart_dev, bt_uart_isr);
@@ -617,7 +620,8 @@ static int h5_open(struct device *unused)
 #if defined(CONFIG_BT_CTLR_ASSERT_HANDLER)
 void bt_ctlr_assert_handle(char *file, u32_t line)
 {
-	printk("Assert %s:%u", file, line);
+	printk("BT_CTLR Assert %s:%u", file, line);
+	sys_reboot(SYS_REBOOT_COLD);
 }
 #endif /* CONFIG_BT_CTLR_ASSERT_HANDLER */
 
@@ -756,5 +760,3 @@ next:
 		net_buf_unref(buf);
 	}
 }
-
-