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Downgrades are possible on certain older models, but as far as I know it requires a bootloader exploit and the boot may be tethered i.e. requires a PC to poke it before it will boot.

32 bit devices can use coolbooter: https://coolbooter.com/

And I've not used this tool but am aware of it: https://github.com/MatthewPierson/Vieux



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