The "problem" then is you have to record the original values in case you sell the handset on at some later stage, as you would really need to revert them back. Then the software can drive the scope correctly. In effect you pick ETX-90 then change the values to the drive ratio's of the ETX-60.
Condition is Used Comes with hard carry case. This will help the beginner, as well as the expert and more experienced astronomers, to improve their user experience while viewing the stars. You can "hack" the handset software to make it operate, it is a simple change to 2 values that define the ratio of the 2 drives. This telescope from Meade instruments comes with quite a handy and easy-to-use electronic hand controller included.
I have two 494 and two 497 handsets and the ETX-60/70 does appear on either 497 to be selected. 8 LX200-ACF in the observatory and my ETX-105PE (one of the telescopes I use at star parties). I know the Meade Autostar #497 manual says all ETX models but I do not think it is correct. Leave them up or fold them down when wearing eyeglasses. Still not sure it will do any use, the ETX-60 came out with the 494 handset and, as far as I know, the 497 does not have the ETX-60 or ETX-70 as an option when selecting the scope model. One aspect is to drop the USB port speed down.
They prefer the old serial port, some USB-Serial connectors will work, others fail. You need the latest loader off of the Meade Support site, as well as the relevant firmware and several pages of instructions.
You can update the 497, although it depends on whether it is Ver1 or Ver2 as to what firmware will load.