Last night, my phone converted into a beautiful (an expensive) brick, in an aeternal loop.
I don't know why, because I did everything as it is in the guide. See the video below.
I tried everything, but nothing worked.
Happily for me, I download the last ROM official from sam sung, and copy the BL, AP, CSC and CP in latest version of Odin 3, and my phone came back to life.
I hope that this info can help to somebody with the same situation.
Finally, I want to know why the installation of twrp failed, if I did everything what appears en the guide. (usb debug, oem unlocker, copy all the files, etc).
Thanks a lot to all for you contribution to phones!!
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Did you flashed the Vbmeta along twrp? The build in the thread don't work with oneui 3.1, you need to use the beta version, from the Telegram group.