Thank you Mrs Often for your reply. My Kobo has not been connected to wifi, I don't need it, I loaded once through usb on computer and twice through android wall charger. And yes I did see the check mark, so I'll try once more and check how many hours reading time it last and then think about exchange or refund of money, it might be difficult because I bought it while on holidays this summer in France.
And maybe bring it back to firmware 1.9.17
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