Ok, this is pretty simple to do actually, but it seems like alot of people are having trouble with it, so I made this.

Requirements:
Original Nand of banned JTAG
CPU Key of banned JTAG
Original Nand of unbanned Console*
CPU Key of unbanned Console*
*or just kv_dec.bin

HxD
360 Flash Tool
FreeBoot Toolbar

Ok first open up the unbanned nand in 360 flash tool and input the cpu key under the tab keys. Make sure 1BL and CPU are both checked.
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Now click extract. Then click KeyVault and choose a place to save it. Press OK.

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You should now have 3 files: kv_dec.bin, kv_enc.bin, and log.txt. You can delete kv_enc.bin and log.txt.
Now open up the banned nand in 360 flash tool and input the cpu key. Remember to make sure 1BL and CPU are both checked.
Click import, then click keyvault and open the kv_dec.bin

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Choose a place to save the your new unbanned nand. Now open up FreeBoot Toolbox and input the cpu key of your nand. Click Generate Freeboot and let it do it's thing.

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If everything went well, it will tell you that the freeboot image has been created succesfully



*NEXT STEP IS OPTIONAL BUT STRONGLY SUGGESTED*

Now, to prevent e79, you need to change one thing in the newly generated freeboot image. Open up the freeboot image in HxD and change "2004 - 2005" to "2004 - 2007".
Save and rename updflash.bin.

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Now use flash360 to flash this to your jtag and you're unbanned!