Hello,
My Kobo Nia had many problems these times (long boot, hard to wake up, mandatory reboot(s) after copy, etc) and I tried to update it in Wi-Fi (in the parameters). It didn't work well and after that, the Nia didn't work anymore (blinking LED for 32 seconds, the screen suddenly tries to wake up, and the same cycle begins again).
I opened the SD*card, copied the content in my computer but...I don't know what to do with it.
For the moment, I'm using InkBox (which boots but I haven't explored it) but would like to have the opportunity to use the original stock OS. Thanks you !*