How do I upgrade a non-AutoStar ETX to an AutoStar capable ETX?
A. Short answer: you can’t. Meade does not offer an upgrade for the original model ETX (also known as the ETX-90RA or ETX Astro M). But you can mount the OTA on a different mount (see the Telescope Tech Tips page) or (if still available) get a JMI computer system (see the “NGC-microMAX/NGC-MAX” on the Accessory Reviews – Miscellaneous page). Or you could sell it and by a new AT model.