That bit probably is either burned in or stored with the firmware in something more permanent than RAM. Modern RAM has the issue that it is optimized for capacity and speed to a point where state changes can leak into nearby bits.

Few issues with this statement:

- That bit is not stored in RAM but rather somewhere within CPU which can have different bit flip frequency characteristics.

- Even assuming this bit can be flipped, most computers wouldn't have ECC RAM inserted because well... the CPU doesn't support it.

- And even assuming you have ECC RAM inserted, this bit flipping while your computer is running will likely lead to CPU hang considering the CPU didn't fill in error correction bits and will lead CPU to think that pretty much every single byte is corrupt.

- And all in all, even if you did manage to turn on ECC bit, it would only work until the computer gets turned off.