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

[fuero]

I desoldered the battery and followed the firmware flashing instructions.
The firmware from the release page has issues (lots of artifacts), the one from the bin branch works fine.

Be sure to also read the notes given at the wchisp page.

On the new firmware, pressing and holding the second button with cable disconnected enters the bootloader (signified by one a single lit pixel in the middle of the display).

[mtojek]

@fuero As posted here my board with original firmware has the RESET button. Should I keep it pressed while pressing KEY2 or rather desolder the battery?

I'm cool with soldering but it would be inconvenient for development purposes to constantly solder/desolder the batt.

[fuero]

Mine looks exactly the same, but has no RESET button soldered in. As I mentioned previously, once you have the new firmware version flashed, pressing and holding KEY2 before connecting the cable enters the bootloader with the battery still connected.