Unfortunately, I cannot try anything yet. I’m just at the point of studying the differences between modules and estimating the amount of changes needed in firmware.
According to the spec, AT!POWERDOWN command will restart the module if POWER_ON_N is asserted as wp7611 belongs to group B variants. I don’t know if POWER_ON_N can somehow be modified internally by wp76xx software. Our current design relies on SAFE_PWR_REMOVE signal from wp76xx in order to remove VBAT power supply.
If my understanding is correct, the state of POWER_ON_N signal is (or can be) somehow controlled internally while the module is in active mode (as indicated by the timing sequence below). I don’t know about the details.
In any case, I wanted to check if there is a way to initiate shut down of module from software while POWER_ON_N pin is asserted - using at!powerdown command or any other way.