openwrt 加载不了 U 盘

root@OpenWrt:/usr/sbin# block info
/dev/mtdblock11: UUID="1ceae36a-270d-4177-91fa-2c5c8fa86bfd" NAME="EXT_JOURNAL" VERSION="1.0" TYPE="ext4"
/dev/ubiblock0_0: UUID="ac983ba2-d1dbb7cd-b86ca3c2-0c9e2e8f" VERSION="4.0" TYPE="squashfs"
root@OpenWrt:/usr/sbin# dmesg | grep "usb"
[ 5.010000] usbcore: registered new interface driver usbfs
[ 5.020000] usbcore: registered new interface driver hub
[ 5.030000] usbcore: registered new device driver usb
[ 5.440000] usb 1-1: new high-speed USB device number 2 using ehci-platform
root@OpenWrt:/usr/sbin# block mount
block: extroot: failed to load /etc/config/fstab: Entry not found
root@OpenWrt:/usr/sbin# block detect
config 'global'
option anon_swap '0'
option anon_mount '0'
option auto_swap '1'
option auto_mount '1'
option delay_root '5'
option check_fs '0'

不知道怎么弄，从官方刷完 op，就找了别人的教程，然后也挂载不了 u 盘。