I have a Halo Reach slim with a 9504 drive that hasn't been updated in a while.
I had a pre 13146 dash on it.
So I took one of my many unlocked Xecuter PCB's that I haven't been able to use very much yet and dumped my original firmware and then put it (untouched- copied dummy info to OFW pre-13146 (9504) fw in JF) on the unlocked PCB.
I did NOT lock the SPi, or change the physical switch on the PBC to 0 (locked) before doing the Outro/ATA reset in JF.
I in fact followed these directions but SKIPPED steps 12 & 13: http://3dsmall.us/how-to-install-16d4s-unl...west-price.html
I put a burned CD with the 13599 dash update in the drive, booted the slim and after a minute or two I ran into the status code: 3151-351F-B900-0401-C000-016B
I DID google this, and tried searching support.xbox.com and these forums to no avail. I DID try opening the dvd tray (taking out update disc), pulling the plug, plugging power back in, push tray halfway, powering up with power button, only to come back to the same status code. I also tried leaving the disc in the drive.
I have 3 questions.
1) Can I continue with the update successfully on the xecuter PCB and if so how? I'd prefer this method because I figured I could re-use my stock PCB since it wouldn't be locked by the update.
2) If I need to use my original 9504 board, there's no way to avoid it getting locked, right? I'll have to buy a sputnik unlock board or the sputnik spear...
3) Why isn't this information somewhere already, like in the JF tutorial? I mean I know it's probably not common for people to still have an unlocked 9504, but for those of us who do and prefer to update without locking our drives why isn't this info out there already?
I'm used to searching for and finding answers myself but hopefully this will help someone else as well.