WARNING: Units powered by M-BUS (Pow-U) must be connected to an external power supply during firmware upload. Failure to do so may cause power-down during upload resulting in non-functioning unit.
Your board is using {chipset} chipset. Only upload firmware designed for this chipset. Failure to do so may result in non-functioning unit.
Download latest firmware file here
When using URL, only a valid ESP OTA server response will be accepted.