I bought a IHAS 424b a couple of weeks ago, to burn XBOX backups, and it was working fine with the truncate method.
Yesterday, i decided to change the firmware to use the Ixtreme firmwares (because i wanted to burn Forza and it doesnt seem to work with the truncate method), but when it was all over, the drive wont recognize the dvd in it, it just blinks.
It had the GL1B firmware, but i followed the PDF instructions that came with the zip, so i installed the GL1A first and then performed the other steps of the tutorial.
I tried to install the GL1B firmware and re-do the whole process but the drive still doesnt recognise dvds. My system recognizes the drive fine though.
I read in here that maybe crossflashing it to 624 might do the trick butwhen i try to use that it says that i need to repair the checksum because it is invalid, and when i try to do that it says it cannot be repaired.