I recently bought a DX7S that had been stored for a long time. The previous owner had no cartridges and the voices were still good but had a low battery message. I did the typical installation of the socket for a new battery. When I turned on the voices had distorted names and a totally erratic sound.

I tried to load the voices from the computer by disabling the memory protection but the dx7s just stays in "now receiving" and does not finish the loading process

I hope someone can help me diagnose 🙁