>>327034>stop updating If it were battery-backed SRAM, it would lose it, not fail read-only. Looking at GIS, it's actually FeRAM, not Flash. FeRAM is like Flash but an evolutionary dead-end: if Flash is a bird, FeRAM would be a pterodactyl.
If the chip has worn out, Internet says you can flip either of the MSB pins on the address line, because it's a 4096 byte chip, but the sonic 3 ecosystem only uses the first 1024 bytes. So by forcing the highest address line high, you can make it use the (previously unused and maybe not fucked) third 1024 bytes.