Totolink X5000R: How to install on new OEM firmware version?

Hello everyone,

Some regions already support new firmware for easy mesh feature. (V9.1.0cu.1929_B20210629)

but unfortunately it also checks the uploaded firmware file before install it.

The details of my steps:
Go to OEM web UI and select 21.02 binary, but it always shows "invalid firmware file".

Does anyone know how to flash OpenWrt based on this new OEM firmware?
Thank you!

Then try downgrading based on

Thank you! It works well.
After downgrading is done, I follow the post below to flash 21.02.1 and everything is OK.

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