AT+SYSREG=0,0x60091020
+SYSREG:0x1
AT+SYSREG=0,0x60091004
+SYSREG:0x1
OK
On a fresh boot, only GPIO1 is set (I’m using GPIO0 and GPIO1 as UART interface therefore I assume GPIO1 is TX output).
Perhaps GPIO3 and GPIO14 are floating and thus not in any definite state.
The strongest point for me is if I boot with no physical antenna attached and then explicitly enable internal antenna (by setting 3 HIGH and 14 LOW) then reception dramatically improves.
Still a bit of a mystery of how its working…