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Merge pull request #1246 from per1234/uno-r4-wifi-hid-upload-workaround

Document special upload procedure in UNO R4 WiFi HID tutorial

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`@@ -36,7 +36,17 @@ To turn your board into an HID, you can use the keyboard/mouse API that is b`
`36`	`36`	`- [Keyboard](https://www.arduino.cc/reference/en/language/functions/usb/keyboard/)`
`37`	`37`	`- [Mouse](https://www.arduino.cc/reference/en/language/functions/usb/mouse/)`
`38`	`38`
`39`		`-In the section below, you will a couple of useful examples to get you started!`
	`39`	`+## Sketch Upload Interference`
	`40`	`+`
	`41`	+As a consequence of the multi-processor design of the UNO R4 WiFi board, uploads may fail with a "`No device found on ...`" error when the board is running a sketch that uses the HID capabilities.
	`42`	`+`
	`43`	`+For this reason, you should use the following procedure to upload under these conditions:`
	`44`	`+`
	`45`	`+1. Press and release the button marked "RESET" on the board quickly twice. The LED marked "L" on the board should now be pulsing.`
	`46`	`+`
	`47`	`+2. Select the port of the board from the menu in Arduino IDE. The port might have changed after the previous step, so make sure to verify that it is selected.`
	`48`	`+`
	`49`	`+3. Upload your sketch as usual.`
`40`	`50`
`41`	`51`	`## Keyboard`
`42`	`52`

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