A week ago, I accidentally uploaded a loop code to my arduino that freezes my computer, so I can't upload new code to it, so the question is how can I reset it without uploading code
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This might work, take these steps:
Power off the board completely
Remove the USB cable
Hold down the Reset button
keep it held down (or, run a jumper wire from the RESET pin to the GND pin).
Still holding down Reset reconnect the USB cable.
Start uploading a sketch that does not have this problem (I use the Blink sketch).
When you see the Receive light blink, release the Reset button
Change your code and add a delay(3000), or more in setup(). This allows easy recovery from a serial flood.
Note: I have seen this happen several times when I flood the serial output. An indication is the TX light is stuck on. I always add a delay in setup so I can reset it and upload new code.
IDK, close the serial monitor and upload Blink?