Uno r3- avrdude verification error

Hello. I recently bought uno r3 board and when i tried to run servo i got this message:

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

and i cannot upload any sketches. Power led is on; TX and L are lighting and when trying to upload anything L, TX and RX blink briefly and TX and L are on again. 3,3V/5V work normally, changing ports/reinstalling drivers doesn’t help. I tried to burn bootloader but i get another error instead:

avrdude: usbdev_open(): did not find any USB device “usb”

I found a topic with similar problem but i don’t quite understand what to do: Adafruit customer service forums • View topic - Verification error, content mismatch (Arduino Uno)