How to delete files from the Kobo Arc 7 if it won't turn on because its memory is full?

Kobo will not switch on properly because memory became full without warning me. As it will not turn on I can't delete files to free up memory. As it will not switch on when I connect it to a PC the PC can't read the files so I can't delete them that way.
Any suggestions?

That's odd. To be honest with you, I think you're only option is resetting the tablet. Or contact Kobo and ask for the nearest service center in your area. Have experts check it. Good luck!

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