ESP32 S2 mini vs low voltage

[ngfuture]

Hi,

I want to upgrade a little IOT station powered with a solar panel, without powerbank.
Initially it was built on AVR cpu, now I want to upgrade it with WI-FI functionality.

I ran into this problem: when esp32-s2 is powered with low voltage (eg: sunrise), it doesn't respond correctly.
It need a manual reset to start working.
I've tried to implement BOD, watchdog to try to reset automatically, without success.

How to replicate the problem:

• esp32 s2 mini dev board

• put on firmware a simple blink example (with or without BOD&watchdog, doesn't matter)

• power the device using a laboratory power supply

• power with 5V: device start correctly

• without turning off, reduce voltage below 3V: device stop to work

• without turning off, increase the voltage up to 5V: device doesn't work

• without turning off, click reset button: device restart correctly

Do you think is it possible to resolve this issue via software ?

Thanks in advance,
NG