Unbrick Samsung A40 not going into download mode

I accidentally installed an outdated bootloader to my device and I cannot seem to access the download mode I also tried to access the recovery and I tried letting the device run out of battery by holding down the power button for a long time. And then connecting the phone to the computer while holding both the volume and power buttons. It only shows the circle with a lightning bolt in it. It also shows a cyan box with red text reading " rev. check fail. Device: 4 binary: 2 (otb)