Yes Firmware for ATV 1200 and ATV1220-T are 2 different firmwares.
The ATV-1220T has the DVB-T tuner pre installed into the box, so therefore requires different firmware for it. However it is based on the ATV 1200 motherboard, so that is probably why the upgrade worked for you.
Sorry but we do not carry the ATV 1220T model in North America, as it does not work for us here, as we use ATSC
Please send an email to our partner in china, firstname.lastname@example.org and they will assist you with providing you with the latest firmware files for the ATV 1220T so you can get it working for what you purchased it for.
I'm an atv1220 owner and now I have android 4.2.2 running on my device (beta version, but runs great).
If you finally hadn't support from Migyca email, here you have more info: viewtopic.php?f=7&t=1918
My next step: Try an atv1200 firmware and manually install DVB-T apks (can be extracted from atv1220 firmware). If it works I could install OTA updates and then reinstall DVB apks every time I install an atv1200 firmware update. But it doesn't work, I'll install back other firmware.
I want to make a suggestion for next firmware: As in linux, is there anyway to modify android kernel and add iso9660 & UDF support?
I only know one device that supports this feature, but as the modifier says, it looks easy: http://forum.xda-developers.com/showthr ... ?t=2230059
This would make atv1200 first tv box set with DVD/CD support using any USB DVD/CD unit.
Best regards and congratulations for your job.