You need to be on Rogers stock firmware to apply it. If you're not, grab the fastboot files from sbf.Droidevelopers.org.
If you're on jelly bean already (from another variety like telstra), you might have to wait until the firmware team locates the fastboot files for jelly bean.
Can someone confirm if you can fastboot ICS over JB? if so, what's the process?
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I am on stock Rogers firmware and it's still not working. I've tried a bunch of different things including using CWM to flash it but it still doesn't work. I get errors.
You can downgrade to the stock ICS rom from Jelly Bean in fastboot by deleting a couple of lines from the .xml file in the .zip file. I forget what they are off the top of my head, but I think they were right at the beginning near the "getvar" line.
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