Also, if we downgrade, theoretically speaking, what and how is it changed?
Is it like replacing the .cia of every title or how?
Basically each and every title on the NAND in uninstalled and an old version of it (for example the versions from 9.2) is then installed... We must uninstall the old version as the currently installed version is always checked and if the version you're trying to install is less than the currently installed version it won't install the title, whereas if it has nothing to check against then it just installs it
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Now I need clarification, what is the supported ntrcardhax versions? Also, what special requirement is needed?
Ntrcardhax is supported up to 10.3, but you need some special hardware. The gateway is probably the only device (currently) able to take advantage of it, other than a homemade device (like the passme with an FPGA soldered to it (FPGA = Field programmable gate array))