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NRF51 Firmware update via GPRS

Hi everyone! 

At the begining I want to write what I'm using to make everything easier.

Device:

- NRF51822 xxAC (This one).
- GSM module Simcom Sim 7000E (This one)

Environment:

- Visual studio 2019 with Visual GDB.

My problem is:

I need to have posibility to update fimware on my NRF via GPRS connection (I mean download new firmware thru GPRS and then update firmware). What I found on this forum make me think it is possible. But I'm newbie with NRF devices and BLE funcionality etc. I found that someone edit bootloader from DFU example. I'm not feel strong enought to do this. I don't know how and where store downloaded firmware and moreover what to do next to make update.

My question is, If somewhare is any example or tutorial how to do this? Or someone did it and can share their achivements? Or just can someone help my with it? I don't know how to start.

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