If you read the save type carefully, it says 512Kbit EEPROM. You have to convert the bit to byte by dividing the number 512 by 8. This is already mention in the sticky FAQ thread. However, since you are using 2.6a, you should just leave the save type as auto.
After you change the save type, you should save the settings and reload the game.
After you change the save type, you should save the settings and reload the game.