How to flash the ESP Wroom-2 modules
https://drive.google.com/drive/folders/0B2r3adxgXxqMOGNYd1AxN3E3M2c?usp=sharing
##Download Flash tool 2.4 and open the folder as shown in below picture
###Please selec the memory location in ADDR section as follows;
boot_v1.6.bin : ADDR (0x00000)
esp_init_data_default.bin : ADDR (0x01000)
blank.bin : : ADDR (0x7e000)
##Front side of the ESP Wroom-2
Using NodeMcu tool