The following images are available:
Kobo N204B Aura HD (4.38.21908)
Kobo N236 Aura Edition 2 V1
Kobo N236 Aura Edition 2 V2
Kobo N249 Clara HD (4.38.21908)
Kobo N250 Aura H2O
Kobo N306 Nia
Kobo N306 Nia C (hasnas managed to make the original image work).
Kobo N418 Libra 2 (there are three versions of the image due to hardware changes)
Kobo N437 Glo HD
Kobo N873 Libra H2O (thanks to @minosimo)
Kobo N506 Clara 2E
Kobo N587 Touch 2.0
Kobo N613 Glo
Kobo N647 WiFi (1.9.12)
Kobo N647B WiFi
Kobo N705 Mini (4.38.21908 & 3.19.5761-s firmware revisions)
Kobo N905B Touch
Kobo N905C Touch
Kobo N289 Wifi
*Kobo N514 Aura*
The Aura N514 does not have removable internal storage so no image is available. People have used a N250 Aura H2O image copied to a µSD card and booted from that card in the external µSD card slot. See
message #124 in this thread for one user's experience.
The following models have fixed internal storage and no image is available.
Kobo N905 Touch
Kobo N709 Aura One
Kobo N867 Aura H2O Edition 2
Kobo N782 Forma
Kobo N777 & N778K Sage
Kobo N428 Libra Colour
Kobo N367 Clara Colour
Kobo N365 Clara BW