Entering bootloader mode for flashing a modified firmware

[syntheit]

I would like to flash a modified firmware with some modifications to the functionality to the LEDs. However, after any attempts, I am unable to get the device to enter bootloader mode and appear in QMK Toolkit. I do not have a button soldered on the reset switch, so I'm bridging it using a screwdriver. I tried bridging the right two circles, bottom two circles, and top two circles, to no avail. I have the screwdriver on the circles as I'm plugging it in. Am I doing something wrong?
I would appreciate any help, thanks

Board version is v0.6.1

[bluepylons]

Did you install the STM32 drivers, and are you "long pressing" (shorting the pins for more than 5 seconds) to enter into the bootloader?

If you try dfu-util directly (instead of via QMK toolbox) does it also work? I recall there occasionally being issues with newer versions of dfu-util, so you might also want to try dfu-util 0.8 or older.