The main issue would be how to copy the data to the new eMMC after getting the old eMMC off the motherboard. Our electronics shop at work found the removing the eMMC from a board often made it non-readable. Though that pair of pads labelled S1 and Download with a switch icon looks interesting.
The two eMMC chips used are a Phison PTE7A0YJ-32GE and a MK MKEMF032GT1E-C. MK seems to show a maximum 128GB in their family while Phison seems to show a 256GB in their family.
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