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it was just dead when I wanted to read something again. Frozen with my last ebook as a cover. I charged it 1h with no diffrence. Then I opened the back and meassured with the voltmeter the battery potential of 0V. So I decided to replace it. I soldered off the old battery, soldered on the new one in the previous cable orientation/polarity.
I checked the voltages with the voltmeter before and after charging it via USB.
The meassured battery potential rose from 3,5V to 4,2V - capped. Since then it's bricked. I started to factory reset it a described by kobo. But it shows no reaction besides being "se blank 6sll" under windows
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