DS18B20 module hang up ESP8266 ESP-12F?

I have upload 1.87 from http://www.espruino.com/files/ according to "README_flash.txt" and got new problem - firmware does not work.

After flash v1.87 firmware, WEB IDE displays correct version:

>process.version
="1v87"
>

After flashing of simple test code:

console.log('HELLO');

device reboot and hang up again:

_____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v87 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 4MB:512/512, manuf 0xe0 chip 0x4016
>Erasing Flash.....
Writing...
Compressed Loading 44 bytes from flash...
 ets Jan  8 2013,rst cause:2, boot mode:(3,4)
load 0x40100000, len 1396, room 16
tail 4
chksum 0x89
load 0x3ffe8000, len 776, room 4
tail 4
chksum 0xe8
load 0x3ffe8308, len 540, room 4
tail 8
chksum 0xc0
csum 0xc0
2nd boot version : 1.4(b1)
  SPI Speed      : 80MHz
  SPI Mode       : QIO
  SPI Flash Size & Map: 32Mbit(512KB+512KB)
jump to run user1 @ 1000
don't use rtc mem data
Disconnected
ERROR: Prompt not detected - upload failed. Trying to recover...

• what might be wrong? Please advise. Thank you again.
  
  

Notes: My previous version Espruino v1.89 works fine with above simple test; Now I am using 5V 5A external power supplier; I have tested three devices including "NodeMCU board" - WEB IDE console displays ERROR as above.