"I spoke with our Technician and explained the issue you are having. Unfortunately a checksum error indicates the main board will need to be replaced. The cost of a new main board is $164.40 ( a discounted price) plus $60.00 for labor. He said there would be a 1% chance he could clear the error however that chance is VERY RARE and it he was able to do so the labor rate would be $60.00. Please lets us know how you would like to proceed.
Best regards,
Roland Service Department"
So better to buy another used one. For anyone updating, maybe try doing the 1.12 update first.