Finally, I was able to resurrect my Kobo Glo, thanks to all of you for your stepwise guidance and help!
The procedure I followed is as below:
1. Wrote an stock disk image file sent by davidfor on an empty SD card.
2. Opened the back cover of Kobo and replaced the card, powered on the device which asked for setup through Wifi or PC.
3. Instead of choosing the Wifi, I selected setup through PC, and connected the USB.
4. The device demanded a connection to Kobo desktop, which I ignored, and as could see the internal SD card through windows explorer now, I copied the firmware files of FW 3.19.5761 to .kobo folder, disconnected and unplugged the USB cable. The device started setup.
5. After the setup, the device again asked for a Wifi or connection to Kobo desktop. I reconnected the USB and copied the patch file KoboRoot.tgz 'Block WiFi firmware upgrade' enabled in the .kobo folder, and disconnected the USB.
6. After a few minutes, the setup was completed and asked again for Wifi. This time I connected to Wifi and after initial logins, the device prompted an 'upto date FW' status, and came back to life.
I'm grateful to all you guys!
Now I'm only wondering on the academic question, as to why the device became non-connectable through USB in the latest FW? Perhaps some strage reason, I guess.
Quote:
Originally Posted by BobC
This doesn't sound like a firmware update problem; when you connect your Glo do you get the Charge/Connect prompt ? What O.S. is your computer using.
BobC
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Yes, I got a Charge/Connect prompt. I use Windows 10 laptop duly updated. After connecting through USB, the Kobo prompted 'Connected and charging'. It did charge, but I could not anything connected in Windows explorer via USB. So you can't modify the FW or read/write anything on it.
After the downgrade, everything is back to normal.