Can't be directly replaced. Nand Flash replaces the hardware pin-pin, but the software needs to be modified. According to customer requirements, software manufacturer's code, ECC check, etc. It's usually changed. Now Samsung, Hynix and Magnesium don't do this small-capacity nand Flash. You can refer to MX30LF 1G 18AC-TI in Wang Hong, Taiwan Province province and afnd108u3-cka/afnd1208u1-cka/afnd5608u/kloc-0 in Korean ATO solutions.