What is wrong with arduino?

Question

Arduino

Hello, I bought an arduino uno, but I encountered an error,
how to fix it?

avrdude: verification error, first mismatch at byte 0x0000
0x62 != 0x0c
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch

Here is the code:

int ledPin = 13;

void setup()
{
  pinMode(ledPin, OUTPUT);
}

void loop()
{
  digitalWrite(ledPin, HIGH);
  delay(1000);
  digitalWrite(ledPin, LOW);
  delay(1000);
}

Answer 1

Does not want to be sewn - maybe the bootloader is broken.
avrdude - said that what is written there does not correspond to what he was trying to write down.

Answer 2

1. The com port is not configured correctly It is
necessary to check
2. The wrong board is selected It is
necessary to check
3. The USB-UART adapter is faulty
Try flashing with an external programmer 4. MK glitch
(bootloader has flown)
Try flashing with an external programmer If you are not lucky with items 1-4, we take a soldering iron and change the MK

Answer 3

Failed to verify firmware. It is necessary to check the FUSE bits to see if the protection from reading the firmware is worth it.