Add description how to flash the testbed application

Author: squix78

docs/guides/esp32-color-kit-grande.md

@@ -49,7 +49,11 @@ You might need to cut off the pin headers on the other side of the connector PCB
 | [![](../img/guides/color-kit-grande/5_tapes.png)](../img/guides/color-kit-grande/5_tapes.png) |  Peel off the protective film on one side of the four foam stickers and attach them to the front of the connector PCB in the designated areas ("TAPE"). |
 | [![](../img/guides/color-kit-grande/6_display.png)](../img/guides/color-kit-grande/6_display.png) |  Place the display on a clean surface upside down (as to not scratch it). |
 | [![](../img/guides/color-kit-grande/7_FPC.png)](../img/guides/color-kit-grande/7_FPC.png)  |  Feed the two FPC cables of the display module through the cut-outs of the PCB. Insert the cables into the sockets. See the [dedicated chapter below](#operating-the-fpc-connectors) on how to correctly open & close the FPC connectors. Carefully(!) fold the display over such that it rests on the (still protected) foam pads and flip the two pieces over to verify everything fits. |
-| [![](../img/guides/color-kit-grande/8_programm.png)](../img/guides/color-kit-grande/8_programm.png) |  Now would be a good time to proceed with the [software](#development-environment)/[firmware](#sample-project) installation as per the chapters below. You will want to do this now - rather than at the very end - to verify everything works *before* you attach the display. It will be hard to remove from the foam stickers once attached. |
+| [![](../img/guides/color-kit-grande/app-market-1.png)](../img/guides/color-kit-grande/app-market-1.png) |  Now is a good time to test the hardware with a simple programm. You will want to do this now - rather than at the very end - to verify everything works *before* you permanently tape the display with the stickers to the connector board. It will be hard to remove from the foam stickers once attached. Open the (flasher web application)[https://app-market.thingpulse.com/device/tp-color-kit-grande/app/tp-color-kit-grande-screen-test] |
+| [![](../img/guides/color-kit-grande/8_programm.png)](../img/guides/color-kit-grande/8_programm.png) |  Connect your Color Kit Grande with a USB-C cable to your computer. Move the power switch to the on-position. |
+| [![](../img/guides/color-kit-grande/app-market-2.png)](../img/guides/color-kit-grande/app-market-2.png) |  Press the "Flash App" button and select the port of your your device. On Mac OS X it is the cu.wch* device. The name of the device might be different on your operating system  |
+| [![](../img/guides/color-kit-grande/app-market-3.png)](../img/guides/color-kit-grande/app-market-3.png) |  Now the browser will flash the test program. This should only take a few seconds and at the end there should be four progress bars at 100%  |
+| [![](../img/guides/color-kit-grande/testbed.jpg)](../img/guides/color-kit-grande/testbed.jpg) |  After the firmware was flashed you should see four colorful boxes and some text. By touching the display you can draw  |
 | [![](../img/guides/color-kit-grande/10_protective.png)](../img/guides/color-kit-grande/10_protective.png)  |  Remove the remaining protective film from the foam stickers. |
 | [![](../img/guides/color-kit-grande/11_align.png)](../img/guides/color-kit-grande/11_align.png)  |  Attach the display module such that it aligns with the markings on the PCB (white silk screen). |