My Arduino Was Working Fine Few Days Ago But Now It Is Not.
Earlier I Was Using Latest Arduino And Suddenly It Was Not Uploading. I Pressed The Reset Button On Arduino. Then It Said," An error occurred while uploading the sketch
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
"
I Tried Bootload Burn But It Said Access Denied. I Switched To An Older Version, Still No Improvements. Also Did The Preferences To Compilation 
And Upload 
. Please Help Me. 
.
My Arduino Is Arduino UNO r3.
Hi @pranat_1. Please try this experiment and then report back with the results:
This procedure is not intended to solve the problem. The purpose is to gather more information.
- Connect the Arduino board to your computer with a USB cable.
- Press and release the button on the Arduino board that is marked "RESET".
Now please reply here on the forum thread with the answer to the following question:
- Did you see the "L" LED blink multiple times quickly immediately after you released the "RESET" button?
Yes Sir, It blinked multiple times quickly after I pressed the reset button after connecting a USB To my laptop from the arduino.
Which version of Arduino IDE are you using (e.g., "2.0.1")? The version is shown on the window title bar and also in the Help > About (or Arduino IDE > About Arduino IDE for macOS users) dialog.
I ask for this information because I want to give you the appropriate instructions for the IDE version you are using.
Latest version sir.
Arduino IDE 2.2.1
I'm going to ask you to post the full verbose output from an upload attempt.
This procedure is not intended to solve the problem. The purpose is to gather more information.
Please do this:
- Select File > Preferences... (or Arduino IDE > Settings... for macOS users) from the Arduino IDE menus.
The "Preferences" dialog will open. - Uncheck the box next to Show verbose output during:
☑compilation in the "Preferences" dialog. - Check the box next to Show verbose output during: ☐ upload.
- Click the "OK" button.
- Attempt an upload, as you did before.
- Wait for the upload to fail.
- You will see a "Upload error: ..." notification at the bottom right corner of the Arduino IDE window. Click the "COPY ERROR MESSAGES" button on that notification.
- Open a forum reply here by clicking the "Reply" button.
- Click the
<CODE/>icon on the post composer toolbar.
This will add the forum's code block markup (```) to your reply to make sure the error messages are correctly formatted.
- Press Ctrl+V.
This will paste the error output from the upload into the code block. - Move the cursor outside of the code tags before you add any additional text to your reply.
- Click the "Reply" button to post the output.
Respected Sir, This Is What Code I Got.
Sketch uses 924 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
"C:\Users\Pranav\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude" "-CC:\Users\Pranav\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf" -v -V -patmega328p -carduino "-PCOM5" -b115200 -D "-Uflash:w:C:\Users\Pranav\AppData\Local\Temp\arduino\sketches\C7A06C322BEF7E8459701F8C7D92190E/Blink.ino.hex:i"
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Users\Pranav\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"
Using Port : COM5
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: ser_open(): can't open device "\.\COM5": Access is denied.
avrdude done. Thank you.
Failed uploading: uploading error: exit status 1
This time the error is completely different. Compare the error message from your first post:
To the error message in the latest post:
So now we must try to troubleshoot this "Access is denied" error before we can get back to working on the original error.
Do you get that same "Access is denied" error every time you try uploading a sketch to your Uno board?
This error occurs when some other application has the serial port open at the time of the upload. Only one application at a time is allowed to have a serial port open, so when Arduino IDE attempts to open the port for the upload, it fails with this "Access is denied" error. Can you think of any other application running on your computer that could be using the serial port? For example, an external serial terminal program such as "Tera Term". If so, please close that application and then try uploading again. Does the upload still fail with the "Access is denied" error after you do that?
If you can't think of any other application that might be using the port, please restart your computer and then try uploading again. Does the upload still fail with the "Access is denied" error after you do that?
Sir, In starting I told you that i had tried the burn bootloader. SO The first time i tried it was taking too long so i closed it now again it tried it and from then it started showing that access is denied to the respected com5.
YES SIR It was not working no application using the port and neither did it work after the restart.
Please tell us which USB to serial adapter chip your Arduino board has. This is a black chip near the USB socket.
The chip will usually be identified by writing on the top. This might say something like "WCH CH340G" or "SILABS CP2102".
Examples:
WCH CH340
Silicon Labs CP2102
FTDI FT232R
If it isn't clear, alternatively you can provide the link to where you bought the board from and we'll see if we can determine the chip from the product listing.
JK050 is the usb adapter sir.
Please reply sir
Does the chip look like this?:
If so, you're looking at the wrong chip because that is a resettable fuse, not a USB chip.
Sir then it is atmega 16U2
Sir plz reply So That I Can Get Back On Coding.
Do you get that same "Access is denied " error every time you try uploading a sketch to your Uno board now?
Yes sir.