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Nintendo Wii U
Can I still install Cold boot hax after using mocha ?
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<blockquote data-quote="QuarkTheAwesome" data-source="post: 7323754" data-attributes="member: 364754"><p>Gotcha.</p><p></p><p>To understand what goes into a fw.img, I have to talk quickly about how the Wii U does things normally. On your average boot, the Wii U (specifically boot1, so keep in mind that this is mostly educated speculation) looks around SLC for a file named "fw.img" and loads it up. This file is an encrypted and signed version of the code that runs on the ARM/IOSU. Once boot1 has verified and decrypted it, it kicks off the IOSU and it handles loading the rest of the OS. The point to take away here is that <em>all</em> the IOSU-side code (kernel, modules, drivers, userspace stuff) is included in this fw.img. </p><p></p><p>("Probably how it works" alert!)</p><p>Now we get to talk CFW. Our old friend CFW Booter exploits the IOSU once it's already running and starts patching around the code in there. It removes signature checks and does a few other small things before commanding the IOSU to reboot the OS. At some point while it's rebooting, IOS-MCP (<em>not</em> boot1 in this case) goes to load fw.img from the SLC. However, CFW Booter has already patched it to read from the SD instead. Combined with the signature patches from before, MCP sees nothing wrong and loads up our customized fw.img. Ta-da, we now have a CFW running!</p></blockquote><p></p>
[QUOTE="QuarkTheAwesome, post: 7323754, member: 364754"] Gotcha. To understand what goes into a fw.img, I have to talk quickly about how the Wii U does things normally. On your average boot, the Wii U (specifically boot1, so keep in mind that this is mostly educated speculation) looks around SLC for a file named "fw.img" and loads it up. This file is an encrypted and signed version of the code that runs on the ARM/IOSU. Once boot1 has verified and decrypted it, it kicks off the IOSU and it handles loading the rest of the OS. The point to take away here is that [I]all[/I] the IOSU-side code (kernel, modules, drivers, userspace stuff) is included in this fw.img. ("Probably how it works" alert!) Now we get to talk CFW. Our old friend CFW Booter exploits the IOSU once it's already running and starts patching around the code in there. It removes signature checks and does a few other small things before commanding the IOSU to reboot the OS. At some point while it's rebooting, IOS-MCP ([I]not[/I] boot1 in this case) goes to load fw.img from the SLC. However, CFW Booter has already patched it to read from the SD instead. Combined with the signature patches from before, MCP sees nothing wrong and loads up our customized fw.img. Ta-da, we now have a CFW running! [/QUOTE]
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