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I am quite sure that backwards compatibility won't be an issue. As you may know Firefox OS is aimed at low-end phones, so I don't think they plan on ending support for first generation phones… ever?. The only issue is the manufacturer, which has to take care for the Firmware updates for his own handsets. ZTE doesn't look very eager to give its users constant updates.

So no different from any other mobile OS OEMs.

Please let us know if it performs better too!

I guess it will take some time for ZTE to provide 1.3 for their phones, because v1.3 is in pre-release stage for the moment. ZTE took quite some time to provide v1.1, but then 1.2 followed quite quickly [1].

https://hacks.mozilla.org/2014/01/upgrading-your-zte-open-to...

Trunk builds of Firefox OS (version 1.4ish) work fine on my ZTE Open. I doubt they'll see consumer release though. I hope they do but I'm not confident in carriers pushing it.