I have two Kobo Touch B e-readers and one Kobo Touch C, and they all have the i.MX507 processor. It seems the Model B started out with the i.MX508, but at some point they must have switched to the i.MX507.
Below are my notes after opening up the devices to figure out what they really had inside:
Code:
Kobo Touch N905B Specification:
Mark 3 Hardware, Original Touch Model
Freescale i.MX508 Multimedia Applications Processor (800 MHz)
Processor Model: MCIMX508CVM8B (Full Specification)
Kobo Touch N905B text on processor:
Device #1 - MCIMX507CVM8B N78A CTJB1136R CHINA
Device #2 - MCIMX507CVM8B N78A CTJL1136G CHINA
Kobo Touch N905C Specification:
Mark 4 Hardware, Low Cost Model
Freescale i.MX507 Multimedia Application Processor (800 MHz)
Processor Model: MCIMX507CVM8B (No GPU)
Kobo Touch N905C text on processor:
Device #1 - MCIMX507CVM8B N78A BTBD1313E SNGPR