Clarification on flashing new firmware

[Xenira]

Readme states:

Make sure the battery is disconnected.

Do I really need to desolder the battery before flashing a new firmware? Guess I have a switch that I could solder in there but would still be a little inconvenient.

[kilodpace]

They mention it's because you can only enter bootloader mode when the MCU powers up. But on the boards they sell there is an unpopulated reset button, I wonder if that resets the MCU and re-enables the bootloader.

Edit: the reset trace actually works, I'm able to reset the device by shorting it, but I'm still not able to enter the bootloader

[Xenira]

Yeah, managed to reset as well. Hoped the other pads to be the boot button pads, but did not manage to enter bootloader either