[Keyboard] E6V2 BMC OE (#5908)

* rename bmc due to confusion as the bmc from r2 is different

* update readme

* Update keyboards/exclusive/e6v2/readme.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

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+# E6-V2 Bootmapper Client (ps2avrgb) OE
+
+These docs are for the BMC version of the E6-V2 PCB sold during Round 1 which has an atmega32a microcontroller. Please do not flash this `.hex` file on your atmega32u4 equipped E6-V2 or your E6V2 BMC from Round 2. 
+
+Keyboard Maintainer: [MechMerlin](https://github.com/mechmerlin)  
+Hardware Supported: ps2avrgb E6-V2 with atmega32a microcontroller  
+Hardware Availability: [geekhack.org/index.php?topic=90787.0](https://geekhack.org/index.php?topic=90787.0)  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make exclusive/e6v2/oe_bmc:default
+
+Flashing
+
+ps2avr(GB) boards use an atmega32a microcontroller and a different bootloader. It is not flashable using the regular QMK methods. 
+
+**Reset Key:**  Hold down the key located at `K00`, commonly programmed as left control while plugging in the keyboard. 
+
+Windows: 
+1. Download [HIDBootFlash](http://vusb.wikidot.com/project:hidbootflash).
+2. Place your keyboard into reset. 
+3. Press the `Find Device` button and ensure that your keyboard is found.
+4. Press the `Open .hex File` button and locate the `.hex` file you created.
+5. Press the `Flash Device` button and wait for the process to complete. 
+
+macOS:
+1. Install homebrew by typing the following:   
+    ```
+    /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+    ```
+2. Install `crosspack-avr`.  
+    ```
+    brew cask install crosspack-avr
+    ```
+3. Install the following packages:
+    ```
+    brew install python3
+    pip3 install pyusb
+    brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
+
+4. Place your keyboard into reset. 
+5. Flash the board by typing `bootloadHID -r` followed by the path to your `.hex` file. 
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).