OK, scratch my previous post.
I've found that the GDS-2000A series has a 1.30 firmware file available. I downloaded this onto a usb key and plugged it into my IDS-2202A, then used the file browser to select and run the update (see photo). The scope then locked up for about 5-10 minutes, before telling me to power cycle it. Once this was done, the scope booted up STILL with the ISO-TECH branding but now I have V1.30! (see second photo)
So, you can get these ISO-TECH scopes, upgrade them with GW INSTEK files and don't have any issues.
Kind regards,
Marcus