1st
you posted in the wrong spot.
I moved it for you.
that being said
yes you have to spoof the firmware.If you dont the console will know that it has the wrong dvd drive in it and will not work.
You need to put your orig key in the benq firmware then spoof the benq firmware to report as a sam v28.
Then flash that in the benq and it should be good to go.
then you can flash the benq/spoofed firmware in doing a restore.
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