Routeur xiaomi wifi 3g

Hello,
I just received my router and I tried to install openwrt but it did not work I think it is broken (the LED flashes every 10 seconds a blue and a yellow shot)
someone has a solution?
thank you

https://forum.openwrt.org/search?q=Xiaomi%20wifi%203g

(English is preferred for questions and responses. Even a machine translation is reasonable. Retaining your native language as well is certainly appropriate if your question relates to a location-specific configuration, such as an ISP.)

Hello
I just received my router and I tried to install openwrt but it did not work I'm in firmware 2.28 .... when I try to put an older firmware (I'm trying 4) it puts me echec
how can I do ?

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