MicroPython Unable to access REPL

[Giranp]

I am trying to install MIcroPython Firmware on my ESP8266-12E(http://www.kynix.com/Detail/1324534/ESP8266-12E.html) chip. I am using esptool.py to flash the firmware. I have successfully uploaded the firmware esp8266-20170612-v1.9.1.bin followed by a flash_erase. I have used following commands to flash the chip.

*$ sudo esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py v2.0.1
Connecting........_
Detecting chip type... ESP8266
Chip is ESP8266
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 13.0s
Hard resetting...

$ sudo esptool.py --port /dev/ttyUSB0 write_flash --flash_mode qio --flash_size detect 0x0 esp8266-20170612-v1.9.1.bin --verify
esptool.py v2.0.1
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Flash params set to 0x0040
Compressed 598432 bytes to 390604...
Wrote 598432 bytes (390604 compressed) at 0x00000000 in 34.5 seconds (effective 138.8 kbit/s)...
Hash of data verified.

Leaving...
Verifying just-written flash...
(This option is deprecated, flash contents are now always read back after flashing.)
Flash params set to 0x0040
Verifying 0x921a0 (598432) bytes @ 0x00000000 in flash against esp8266-20170612-v1.9.1.bin...
-- verify OK (digest matched)
Hard resetting...*

As you can see verification of flash process is OK. And I can see a new wifi ssid on my wifi list.

Now when I am trying to access REPL via picocom it is hanging on following:

*picocom v1.7

port is : /dev/ttyUSB0
flowcontrol : none
baudrate is : 115200
parity is : none
databits are : 8
escape is : C-a
local echo is : no
noinit is : no
noreset is : no
nolock is : no
send_cmd is : sz -vv
receive_cmd is : rz -vv
imap is :
omap is :
emap is : crcrlf,delbs,

Terminal ready*

I also tried screen, putty and minicom same behaviour on them as well. Also encountered a strange behaviour that it is working perfectly via ESPlorer.

Is there anything that I am missing? Or any suggestion to hunt this situation?

Thanks

[robert-hh]

@giranp Good morning. First of all: You're in the wrong forum. The port for ESP8266 is supported at forum.micropython.org.
Besides that, what you did is right. The information missing is:
a) which kind of board are you using?
b) did you set the access rights for /dev/ttyUSB0, or better, are you as user in the dialout group? You shoud get an error message if not.
c) When connected, try Ctrl-C or Ctrl-B or Ctrl-D, whether this changes the behviour.