How to DOWNGRADE from OS 10.3 to 10.2?!

Hello everybody,

 

I’ve made the mistake to update my BB Q5 from OS 10.2 to 10.3. The only problem that I have is that the life battery is shorter with OS 10.3. With a Wi-fi connection, using whatsApp and browsing the internet, on OS 10.2, the battery lasts 3 days, but on OS 10.3 lasts only 2 days… so please tell me how to downgrade from 10.3 to 10.2. And another small detail: the wifi signal and stability is better on OS 10.2 than 10.3

 

Thank you very much!

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