Try the next drive letter on failure

src/freedombone-recoverkey

 UTILS_FILES=/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-*
 for f in $UTILS_FILES
 do
-  source $f
+    source $f
 done
 
 read_config_param USB_DRIVE
                     reconstruct_key
                     return 0
                 fi
-                dialog --title $"Encryption keys" \
-                       --msgbox $"The directory $GPG_USB_MOUNT/.gnupg or $GPG_USB_MOUNT/.gnupg_fragments was not found" 6 70
-                umount -f $GPG_USB_MOUNT
-                rm -rf $GPG_USB_MOUNT
-                exit 723814
+                if [[ "$GPG_USB_DRIVE" == *"sda1" ]]; then
+                    GPG_USB_DRIVE=/dev/sdb1
+                    write_config_param USB_DRIVE "$GPG_USB_DRIVE"
+                    umount -f $GPG_USB_MOUNT
+                    rm -rf $GPG_USB_MOUNT
+                    ${PROJECT_NAME}-recoverkey -u "$MY_USERNAME" -d sdb
+                    exit 0
+                else
+                    dialog --title $"Encryption keys" \
+                           --msgbox $"The directory $GPG_USB_MOUNT/.gnupg or $GPG_USB_MOUNT/.gnupg_fragments was not found" 6 70
+                    umount -f $GPG_USB_MOUNT
+                    rm -rf $GPG_USB_MOUNT
+                    exit 723814
+                fi
             fi
         fi