DEX to CEX brick help

Hey guys hoping someone can point me in the right direction on this. So in a moment of stupidity when I flashed my CEX over my DEX I turned off the system without installing a CEX firmware so now when my PS3 boots up it beeps about 10 times and turns off. I've read a few posts on this brick and there seems to be a few ways to go about fixing it but most of the posts are old with broken links. I've read about using the e3 card reader, a SD card reader and the old ti84 calculator method. Just wanting to get everyone's input on this. Appreciate it guys

You'll need a dongle(or other) that supports the PSGrade payload witch is nearly all of them, this package has all the files you'll need Download DEX fix.rar from Sendspace.com - send big files the easy way and this tutorial explains it well http://psx-scene.com/forums/f290/fix...-brick-106605/ just make sure you use the correct files and don't substitute anything eg. the firmware