www.chinaphonearena.com

How do you update to the latest os on this device all the instructions and links are in Chinese and all the links require a Chinese account, I would be grateful of a low risk method of putting a new os on, or is a ota update coming soon ?

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Did you see this instructions how to flash Innos D6000?

But I really wouldn't recommend updating at this point unless you don't need Play Store. The 5.1 with Play Store is still a beta.