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Translation via Google Translate:
Hello. I have a doubt I buy a Sony Xperia M5 according to the features says the cell phone has gyroscope but it does not work confused how could I activate it?
hola buenas. Tengo una duda me compre un Sony Xperia M5 según las características dice que el celular tiene giroscopio pero no le funciona
como podría activarlo?
I used Google Translate to find the meaning of your message. Kindly post your future questions/feedbacks in English so we can assist you, this is an English based forum.
I'm not sure if M5 has a gyro sensor, it's not listed in the official product white paper.
You don't need to activate the gyroscope sensor if it's there, it should be working by default. You can test its functionality in Settings -> About phone -> Diagnostics -> Test -> Gyroscope.
@Chichee94 wrote:Translation via Google Translate:
Hello. I have a doubt I buy a Sony Xperia M5 according to the features says the cell phone has gyroscope but it does not work confused how could I activate it?
hola buenas. Tengo una duda me compre un Sony Xperia M5 según las características dice que el celular tiene giroscopio pero no le funcionacomo podría activarlo?
Where did you saw that Xperia M5 have gyroscope? As Quester siad and according Sony Mobile's Developers (here you can find all white papers and detail and official information) Xperia M5 havn't gyroscope. Even 3rd parties sources saying like: GSMArena, Gatgets360, Wikipedia, PhoneArena and ect., saying that Xperia M5 don't have gyroscope (or don't mentioned at all it) 
Always check information about device in manufactor web site, where you can find 100% trust information, also you can always to ask about device for seller, which must know all 100% trust information about device which he/she selling. In 3rd party sources information can be incorrect 