Update new version Nokia WI2A-AC200i

Dear All,

I found the topic "OpenWrt on Nokia WI2A-AC200i" about install openwrt into WI2A-AC200i but i cannot initrsamfs image via u-boot
and i tried to update by sysupdate but cannot tooo
How can i Install
https://downloads.openwrt.org/releases/19.07.4/targets/ar71xx/nand/openwrt-19.07.4-ar71xx-nand-wi2a-ac200i-squashfs-sysupgrade.tar
to my device,Plz help me.
Thanks so much

Model: Qualcomm Technologies, Inc. IPQ40xx/AP-DK04.1-C1
Current Firmware Version: OpenWrt Chaos Calmer 15.05.1 unknown / LuCI branch_WI-FI19_TRUNK_AP.030.26.00_1 branch (git-19.184.25783-c1a75a0)
Kernel Version: 3.14.77

root@OpenWrt:/# cat /proc/mounts
rootfs / rootfs rw 0 0
mtd:ubi_rootfs /rom squashfs ro,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,noatime 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,noatime 0 0
tmpfs /tmp tmpfs rw,nosuid,nodev,noatime 0 0
/dev/ubi0_2 /overlay ubifs rw,noatime 0 0
overlayfs:/overlay / overlayfs rw,noatime,lowerdir=/,upperdir=/overlay 0 0
tmpfs /dev tmpfs rw,nosuid,relatime,size=512k,mode=755 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,mode=600 0 0
debugfs /sys/kernel/debug debugfs rw,noatime 0 0
/dev/ubi2_0 /mnt/CFGTmp ubifs rw,relatime 0 0

root@OpenWrt:/# cat /proc/mtd
dev: size erasesize name
mtd0: 03000000 00020000 "rootfs_1"
mtd1: 03000000 00020000 "rootfs"
mtd2: 02000000 00020000 "cfg"
mtd3: 00040000 00010000 "0:SBL1"
mtd4: 00020000 00010000 "0:MIBIB"
mtd5: 00020000 00010000 "0:BOOTCONFIG"
mtd6: 00060000 00010000 "0:QSEE_1"
mtd7: 00060000 00010000 "0:QSEE"
mtd8: 00010000 00010000 "0:CDT_1"
mtd9: 00010000 00010000 "0:CDT"
mtd10: 00020000 00010000 "0:BOOTCONFIG1"
mtd11: 00010000 00010000 "0:DDRPARAMS"
mtd12: 00010000 00010000 "0:APPSBLENV"
mtd13: 00080000 00010000 "0:APPSBL_1"
mtd14: 00080000 00010000 "0:APPSBL"
mtd15: 00130000 00010000 "0:RES1"
mtd16: 00010000 00010000 "0:ART"
mtd17: 00010000 00010000 "0:EID-A"
mtd18: 00010000 00010000 "0:EID-B"
mtd19: 003c1000 0001f000 "kernel"
mtd20: 01113000 0001f000 "ubi_rootfs"
mtd21: 016c4000 0001f000 "rootfs_data"
mtd22: 01c18000 0001f000 "CFGTmp"