To quote: 05/23/2011 For Immediate Release: The beginning of dual-firmware PS3: PS3_Ed2.pdf The technique outlined in the .PDF will help people learn more about 3.6x firmwares.
The solution relies on the implementation of a second NOR/NAND Flash. Some technical limitations have been identified. But time will help us to remove them.
The information in the document is still theoretical for the moment, however please post results from your testing.
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Here is a follow-up from varicela on PS3 Dual NAND with a Fat 40GB console: elotrolado.net/hilo_la-dual-nand-fat40g-ya-es-una-realidad_1650176#p1725815463
To quote, roughly translated: After several tests trying to take the Fat out of nand console with poor results because of the long cable and data loss, I decided to approach the issue by putting the two Nand and activating of interest.
Here I leave a picture of the folded and functional flash1 a Sem001.