[Solved] How to revert EnGenius ESR-9752 to Factory Firmware

I have installed Lede 17.01.7 on EnGenius ESR-9752 for testing purposes only. Now I want to go back to the factory firmware, but it is still difficult. The EnGenius firmware is made up of two files, KNL and APPS, and I don't know how to flash.
I have soldered pins on PCB to be able to flash from TFTP.
I have another exactly the same, but I don't know how to extract the firmware with U-Boot.
Maybe someone has already done it and can upload it.
Any suggestion?

I did it, dificult, but I did it.

II've been working on it to share it with everyone ...

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