BGA CPUs, like this one, are soldered on a motherboard, as such, upgrading or replacing them is extremely difficult.
E-350
Socket BGA413 (FT1)
AMD E-Series family, BGA413 (FT1) includes E-450 which is the next better model. It is 1.65GHz compared to 1.60GHz for the E-350. Asus does not list anything other than what the motherboard came with as compatible.