diff --git a/src/usb/uf2/ghostfat.c b/src/usb/uf2/ghostfat.c
index 5c7b6c9..9c63ddf 100644
--- a/src/usb/uf2/ghostfat.c
+++ b/src/usb/uf2/ghostfat.c
@@ -363,12 +363,7 @@ void read_block(uint32_t block_no, uint8_t *data) {
                 bl->targetAddr = addr;
                 bl->payloadSize = UF2_FIRMWARE_BYTES_PER_SECTOR;
                 bl->flags = UF2_FLAG_FAMILYID;
-
-#if defined(CFG_UF2_BOARD_APP_ID) && CFG_UF2_BOARD_APP_ID
                 bl->familyID = CFG_UF2_BOARD_APP_ID;
-#else
-                bl->familyID = CFG_UF2_FAMILY_APP_ID;
-#endif
                 memcpy(bl->data, (void *)addr, bl->payloadSize);
             }
         }
@@ -395,12 +390,8 @@ int write_block (uint32_t block_no, uint8_t *data, WriteState *state)
 
   switch ( bl->familyID )
   {
-
-#if defined(CFG_UF2_BOARD_APP_ID) && CFG_UF2_BOARD_APP_ID
     case CFG_UF2_BOARD_APP_ID:  // board-specific app ... may not be usable on other nrf52 boards
-#endif
-
-    case CFG_UF2_FAMILY_APP_ID: // legacy, or where app uses bootloader configuration to discover pins
+    case CFG_UF2_FAMILY_APP_ID: // family-specific app ... Legacy apps, or where the app uses bootloader configuration to discover pins
       /* Upgrading Application
        *
        * SoftDevice is considered as part of application and can be (or not) included in uf2.
diff --git a/src/usb/uf2/uf2cfg.h b/src/usb/uf2/uf2cfg.h
index 3d1bffa..8faab22 100644
--- a/src/usb/uf2/uf2cfg.h
+++ b/src/usb/uf2/uf2cfg.h
@@ -1,15 +1,17 @@
 #include "boards.h"
 #include "dfu_types.h"
 
-// Legacy Family ID for updating Application
-#define CFG_UF2_FAMILY_APP_ID     0xADA52840
-
-// Family ID for board-specific Application
-#if defined(USB_DESC_VID) && defined(USB_DESC_UF2_PID) && USB_DESC_VID && USB_DESC_UF2_PID
-    #define CFG_UF2_BOARD_APP_ID      ((USB_DESC_VID << 16) | USB_DESC_UF2_PID)
+#if !defined(USB_DESC_VID) || !defined(USB_DESC_UF2_PID) || !USB_DESC_VID || !USB_DESC_UF2_PID
+    #error "Per @hathach, 'This repo doesn't accept nrf52840/833 that doesn't have VID/PID'"
 #endif
 
 
+// Family ID for updating Application
+#define CFG_UF2_FAMILY_APP_ID     0xADA52840
+// Board ID for board-specific Application
+#define CFG_UF2_BOARD_APP_ID      ((USB_DESC_VID << 16) | USB_DESC_UF2_PID)
+
+
 // Family ID for updating Bootloader
 #define CFG_UF2_FAMILY_BOOT_ID    0xd663823c