As @Ratattack15 said, try contacting the seller, that is your best bet.
But let’s see…
Can you connect to the osr using Mosa and just the servos not working?
Or you can not even connect to the ORS?
If the site can not even see your toy, then connect the USB cable to the pc.
To verify the connection between the OSR and the PC you can open your device manager, and look for the ports sections.
There you should see a device like this:
Silicon Labs CP210x USB to UART Bridge (COM<some number>)
If this shows up, probably a quick(ish) flashing of the OSR will solve your problems if there are any real issues.
Also if you power up the board of the OSR (connect the USB cable to the pc), you can turn on / power up the servos and it should default go to home (middle position) without any software…
Just to be sure disconnect the receiver on one side (remove the screw).
Since the factory 0 positions of the 2 up/down servos are in different directions (if I’m not mistaken), so without the OSR software the arms can go in different directions and break something.
If the homing does not happen or the servos go in opposite directions, there is a chance the code is missing from your OSR.
If you have more to share please do so, and we might be able to help a bit more.