You need to get to the system parameters located in the diagnostics page. I think it's about page 6 where you will see the cursor blinking at the bottom. You need to type H(1000) place a 1 under bit 2 and be in mode M0 (MZero). Then press parameters button to get to the system parameters. Probably you will see a lot of garbage parameters as you said everything is lost. Look for parameter PSY07 at try to input zero's to see if you can get English back. As far as the parameters for this machine you may need to contact OKK to see if they have the original parameters from the factory. They will probably need the serial number as well as the model.