v2.0 AT Firmware(ESP) and ai-thinker-v1.1.1
They all get flashed successfully. So I connected these modules with an Arduino Nano software serial and all wen fine until I power down and power back on. The blue LED is solid blue and no matter what it will be stuck that way. The power for the ESP is a 3.3V DC LD33 regulator with 100uF capacitor. There are plenty of current available, so I don´think it is power source related. Looks like something happens on software which bricks the ESP.
I strip all the software function and only using basic serial for communicate with the ESP.
Thank you in advance.