RAM are highly likely to be custom packages made for this specific model, so compatible chips with bigger capacity simply don’t exist.
Or they could be just regular phone RAM chips, like those layered on top of phone SoCs.
Even if you manage to install a bigger RAM chip, I’m not sure the chip will be properly identified. Unlike computer RAM, which is designed to be user replaceable, soldered-on chips may not have the built-in mechanism for identification at all, rather relying on the CPU to read board ID resistors to determine configuration, which a bigger configuration probably was never programmed.
Since the hardware was never designed with bigger RAM, I’m not sure if iOS will try to use the extra RAM at all. It could statically configured to use only the allocated amount, at least so for VRAM. Not sure if that is actually the case though.
NAND storage chips can be replaced, but in order for the iOS device to be properly restored and activated, the device serial numbers and other hardware identity has to be modified. This must be done with special equipment so definitely not a DIY job.
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