I pulled a 24c02 eprom out of a VW Jetta to turn off the Immo. I used the gq4x to read the code I then saved the file and opened it in Cal15 to turn off the Immo then saved the new code. I then erased the chip and after many attempts it finally passed the blank chip verify. I then write the chip with the new code. It seems to write but it fails to verify.it also will not if check when I use 24co2 or 24co4. Why?