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You could check the SD card for defects (read errors) maybe you just need a new one.
If you have it open anyway you could disconnect the battery to simulate a hard power off without waiting for the battery to actually run out entirely. Although I'm not sure how/why that would fix things.
The only thing I can think of that would cause reboots is sickel, but that should be gone after a factory reset so ... unless performing firmware update is part of the loop, i.e. you're registering with Kobo every time ... not really sure what's going on with your device. Good luck.
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Thank you, I'm too afraid to simulate a hard power off, so I removed the microSD card and put the device on the side. My theory is that a problem of software, not hardware, so it's better I don't mess with hardware device.
I have some news, but I really don't know the consequences of what I found. I mounted a virtual machine with ubuntu on my notebook and plugged the microSD. The ubuntu see the 3 partitions (KOBOeReader, recoveryfs and rootfs). The KOBOeReader partition seems to be empty. While the recoveryfs and rootfs has some files. I'm posting the terminal images.

[Images violate Posting Guidelines for size - MODERATOR]
My conclusion is the microSD is not corrupt, probably the files on him is. I tryed to make some operations (I have a backup made with USB Image Tool) but I have no permissions. Anyone has a ideia?

I'm not really familiar with linux maybe I'm missing something
Ah! I tryed to make a factory reset without the microSD. He just don't respond. When I put the microSD back he still continues the loop.