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Everything was fine on my rooted device with magisk, until I flashed a custom recovery (TWRP) on RECOVERY partition. That didn't work, resulting in a message "recovery error validating footer vbmeta" during boot into "download mode".

Perhaps the device was still ok after that. However, trying to fix the message and put TWRP to work, I flashed a vbmeta.img on VBMETA partition. This resulted in the current boot loop, I suppose because of some checksum regarding vbmeta and the (stock) root partition.

Is there any hope for this device?

I am still waiting for the battery to drain, but so far all the attempts with using the buttons/USB failed to be able to communicate with the device in any way. I does anything other than just rebooting.

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Following @alecxs advice, I managed to exit loop and enter download/odin mode:

1) Just drain the battery until it turns off.

2) Hold vol+ and vol- while connecting usb cable.

3) Press vol+ to enter download/odin mode.

ps. The fix of the system is subject of another question.

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