It's not memory, but rather physical fuses that have been blown on the die itself, similar to the Xbox 360's downgrade protection fuses and CPU key. Much like the Xbox 360, the only way to bypass it would be to do something like a reset glitch hack to glitch the state of the CPU right as it tries to read the state of the fuses and bypass that check, and that would require a specific modchip for every individual device. Another option would be to replace the SoC with one that does not have that protection enabled to begin with.