Thx for your info.!
I got the OEM (OTA) firmware image on this thread by it seems not valid to extract UBI image by using your provide instructions.
The original OTA image name is Dynalink-RT5010W-d350-V1.10.01.201_sysupgrade_firmware_wififw.bin and I rename it to oem_firmware.bin
below is the output when I reun dumpimage:
fw$ dumpimage -l ./oem_firmware.bin
GP Header: Size d00dfeed LoadAddr 2d20aa4
fw$ dumpimage -T flat_dt -p 0 -o dynalink-dl-wrx36.oem.ubi oem_firmware.bin
dumpimage: failed to verify header of FIT Image support
dumpimage: Can't extract subimage from oem_firmware.bin
It seems the OTA firmware is not a FIT image.
Any suggestion for me to make it work?
Or would you pls. send me your OEM UBI file instead?