Is it 3.16.10 firmware? If it's sickel (auto-reboot-watchdog added in 3.16.10), then even letting the battery die, won't help any. It'll just loop again when you power it back up.
Hitting the reset button while it's showing the loading squares (five times) should make it factory reset. If you can turn it off entire, hold the power button as you turn it on and tap both bottom screen corners, should factory reset as well. But you lose your data for it.
If you don't mind opening it up you could take out the SD card, mount it in a Linux PC and remove /usr/local/Kobo/sickel
Last edited by frostschutz; 08-04-2015 at 08:31 PM.
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