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Updated First steps (markdown)

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First-steps.md

@ -20,3 +20,12 @@ This version can charge the internal lipo battery via the USB. There is a led in
## Battery life
An internal battery between 1000 and 2500 mAh should last several hours of use, depending App use. The standby consumption is [very low](https://github.com/eried/Research/blob/master/HackRF/PortaPack/h2_standby_consumption.jpg), around 52 µA, so you do not need to worry to remove/disconnect the battery in normal circumstances.
# About firmwares
If you bought a standalone HackRF, it probably came with the GSG firmware flashed onto it. This enables usage over USB from a computer.
When buying pre-assembled HackRF + PortaPack bundles, they typically come with some version of the mayhem firmware, but one important thing to understand is : the firmware is always flashed on the HackRF board, PortaPack has no flash nor CPU, is basically an interface module that enables standalone usage without a computer. It provides screen, buttons, a coin cell to preserve settings and time between usages, some versions a high precision clock signal and a battery.
Although the mayhem firmware gives you the possibility to directly use a lot of functions on the field without a computer, it also provides a HackRF mode which enables the user to start a version of the original GSG firmware and use your HackRF via USB. However if you separate the two boards, you wont be able to use the menu and enable HackRF mode so if you want to use your HackRF that way you'll need to flash it with the GSG firmware.
In case you bought a PortaPack separately or want to upgrade your firmware, check out our [Update firmware](https://github.com/eried/portapack-mayhem/wiki/Update-firmware) page!