Galaxy a5 2016 doesn't install marshmallow update

A couple of days ago I got my Galaxy a5 2016 (model a5100) and immediately started to receive these notifications about software actualization. Since then I've tried to update the OS 3 times, I wake up everyday to a new notification of updating and I start to donwload but it fails installing the firmware. The phone turns off and starts and then just appears the lock screen (or whatever is called) and the minute I unlock it it says there is an error with the firmware and to take it to Samsung service. The third time I tried I got a screen with a dead Android and an exclamation sign... Then it turned off again and started as usual with the firmware error notification... Any suggestions?

Sorry for my English, it's not my firts language

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