1. Turn on control flags switch as default.
2. Auto-change control flags switch when 4.21+ alt switch is changed.
3. Fix resign NPDRM SELF/SPRX option, previous version not working.
4. Update instructions.
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I wonder what else is stored in the area and how long the data in it persists, so my next idea is to code an isolated elf, that allows me to specify the value written to channel 64 and then dumps the data from channel 73.