How can I bring MT-300A back to life?

I had no luck with routers GL-MT300A.
I bought 3 of them in 2016 year.
In the first router, soon stopped working Wi-Fi.
The second router after pressing the reset button for 10 seconds stopped working at all .

How can I bring them back to life?

PS. Third router with Firmware 2.265 is until still working.

You tried de brick using uboot?

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No, haven’t tried it yet. Thanks for reminding me!

Hooray! :smile: MT300A has already been restored using your method!
alzhao, thank you very much!

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To great unfortunately, the other two routers GL-MT300A cannot be revived with the same method.
The firmware is loaded, the update process reaches 100%.
But more nothing happens, the update window does not closed.

In the beginning, I used the openwrt-gl-mt300a-clean-2.264.bin firmware, which previously worked fine on all three GL-MT300A.

Then I tried to use the new firmware gl-mt300a-3.0-1011_clean.bin. But this also did not give good results.
But after trying to revive routers are still unavailable at address (also
As a result, out of three routers, only one works.

And what do I need to do now?