I do not know what you did. But when I bricked my Aura I powered off, pushed and held the light button and slid the power button to the right and held it there. It resulted in a factory reset.
The main reason for the pictogram not working is not powering down and restarting in between copying steps. Just repeat 2d. and 2e. when you have access to your Kobo SD-card again.
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