Asus RT-AX53U overlay size

Hi, I recently bought Asus RT-AX53U as replacement for Archer C6 ( mainly because flash size ) but after installing 23.05.03 build of openwrt overlay partition is only ~33MB.

AFAIK this router supports dual firmware, but I don't need it and I would appreciate all the available NAND storage ( should be around 100MB ), can I do something about it w/o forking and building firmware myself?

You could wipe the 2nd firmware and add it as an extroot, but it wouldn't be the same partition as the default /overlay.

You can use USB stick without breaking revert to OEM

Are there any news about the "OpenWRT partitioning" and Asus RT-AX53U.

I installed the openwrt-23.05.4-ramips-mt7621-asus_rt-ax53u-squashfs-factory.bin using the commands:

mtd-write -i openwrt-23.05.4-ramips-mt7621-asus_rt-ax53u-squashfs-factory.bin -d Kernel -r

... and the /overlay partition is still about 33 MB big - instead of 90 MB.

Related PRs:

Details:

# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 4.0M      4.0M         0 100% /rom
tmpfs                   121.4M      1.3M    120.0M   1% /tmp
/dev/ubi0_1              33.3M     22.2M      9.3M  71% /overlay
overlayfs:/overlay       33.3M     22.2M      9.3M  71% /
tmpfs                   512.0K         0    512.0K   0% /dev

# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00080000 00020000 "u-boot"
mtd1: 00060000 00020000 "u-boot-env"
mtd2: 00100000 00020000 "nvram"
mtd3: 00100000 00020000 "factory"
mtd4: 00100000 00020000 "factory2"
mtd5: 03200000 00020000 "firmware"
mtd6: 00400000 00020000 "kernel"
mtd7: 02e00000 00020000 "ubi"
mtd8: 03200000 00020000 "firmware2"
mtd9: 01020000 00020000 "jffs2"

Are there any steps which should be done to "maximize" the size of the /overlay partition?
(I do not need any backward compatibility with original Asus fw)

Thank you...