Could not write to NFS share


I have two NFS share exported in openwrt 22.03.3 Raspberry pi4:

/mnt/sda1/ *(rw,all_squash,insecure,no_subtree_check,fsid=1)
/opt/ *(rw,all_squash,insecure,no_subtree_check,fsid=2)

On client PC(Ubuntu), I mounted them in fstab:

#mount nfs share /home/wu/nas/hddusb  nfs  rw,user,auto,nofail, 0  0 /home/wu/nas/sdcard  nfs  rw,user,auto,nofail,  0  0

I am able to read/write on the first one(hddusb), but read-only on 2nd one(sdcard)

The 1st share is located on the USB harddisk with NTFS system(mnt/sda1).
The 2nd one is located on the sdcard(the 3rd partition on SD CARD) with ext4 system.

How to make sdcard share writable?