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Add notes and links to ZED-F9P firmware information.
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Firmware/readme.md

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###
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### Firmware
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There are two firmwares that operate on the device:
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* Firmware on the ZED-F9P Receiver
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* Firmware on the ESP32 microcontroller
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This folder contains the firmware for the ESP32
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* **RTK_Surveyor** - The main firmware for the RTK Surveyor
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* **Test Sketches** - Various sketches used in the making of the main firmware. Used internally to verify different features. Reader beware.
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* **Test Sketches** - Various sketches used in the making of the main firmware. Used internally to verify different features. Reader beware.
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----
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### A note about ZED-F9P firmware
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The firmware loaded onto the ZED-F9P receiver is currently one of two versions: v1.12 or v1.13. All field testing and device specific performance parameters were obtained with v1.12.
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v1.12 has the benefit of working with SBAS and an operational RTK status signal (the LED illuminates correctly).
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v1.13 has a few RTK and receiver performance improvements but introduces a bug that causes the RTK Status LED to fail when SBAS is enabled.
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A tutorial with step-by-step instructions for locating the firmware version as well as changing the firmware can be found [here](https://learn.sparkfun.com/tutorials/how-to-upgrade-firmware-of-a-u-blox-gnss-receiver).
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More information about the differences can be found [here](https://www.u-blox.com/sites/default/files/ZED-F9P-FW100-HPG113_RN_%28UBX-20019211%29.pdf).

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