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Update README.md

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@ -74,20 +74,7 @@ For other boards, please check the board definition for details.
You can burn and/or upgrade the bootloader with either a J-link or DFU (serial) to a specific pre-built binary version
without the hassle of installing a toolchain and compiling the code.
This is preferred if you are not developing/customizing the bootloader.
To flash version `6.1.1r0` using J-Link:
```
make BOARD=feather_nrf52840_express VERSION=6.1.1r0 flash
```
To upgrade with dfu serial
```
make BOARD=feather_nrf52840_express VERSION=6.1.1r0 dfu-flash
```
Pre-builtin binaries are available on GitHub releases.
Pre-builtin binaries are available on GitHub [releases](https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases)
Note: The bootloader can be downgraded. Since the binary release is a merged version of
of both bootloader and the Nordic SoftDevice, you can freely upgrade/downgrade to any version you like.