Restart to use Web IDE after Flash of ESP8266-01

Even I only do a erase_flash without setting ESP in boot mode, it's the same.
From the console in settings.

conection ok

Initialising Debugger
Initialising Tour
Initialising SettingsProfile
Initialising HelpLinks
Loaded code from storage.
>>> Connecting...
Set Slow Write = true
[object Object]
Connected [object Object]
Received a prompt after sending newline... good!
>>> Sending...
---> "\u0010console.log(\"<\",\"<<\",JSON.str­ingify(process.env),\">>\",\">\")\n"
>>> Sent
Got "< << {\"VERSION\":\"1v91.66\",\"BUILD_DATE\":­\"Mar  5 2017\",\"BUILD_TIME\":\"14:37:09\",\"GIT­_COMMIT\":\"567fee8447461adf4a57d7630192­9b3f63edb601\",\"BOARD\":\"ESP8266_BOARD­\",\"CHIP\":\"ESP8266\",\"CHIP_FAMILY\":­\"ESP8266\",\"FLASH\":0,\"RAM\":81920,\"­SERIAL\":\"18fe349d-47ca\",\"CONSOLE\":\­"Serial1\",\"EXPORTS\":{\"jsvLock\":1075­850320,\"jsvLockAgainSafe\":1075850372,\­"jsvUnLock\":1075850744,\"jsvSkipName\":­1075859352,\"jsvMathsOp\":1075864552,\"j­svMathsOpSkipNames\":1075866244,\"jsvNew­FromFloat\":1075857060,\"jsvNewFromInteg­er\":1075856960,\"jsvNewFromString\":107­5856620,\"jsvNewFromBool\":1075857028,\"­jsvGetFloat\":1075862368,\"jsvGetInteger­\":1075858848,\"jsvGetBool\":1075862728,­\"jspeiFindInScopes\":1075877572,\"jspRe­placeWith\":1075877292,\"jspeFunctionCal­l\":1075887616,\"jspGetNamedVariable\":1­075879416,\"jspGetNamedField\":107587986­0,\"jspGetVarNamedField\":1075879992,\"j­svNewWithFlags\":1075856360}} >> >\r\n>"
Loading http://www.espruino.com/json/ESP8266_BOA­RD.json
Device found (connectionId=1)
[success] Connected to port /dev/ttyUSB0
>>> Connected to port /dev/ttyUSB0
Board JSON loaded
Set Slow Write = true
FIRMWARE: Current 1v91.66, Available 1v91

conection lost

Initialising Debugger
Initialising Tour
Initialising SettingsProfile
Initialising HelpLinks
Loaded code from storage.
>>> Connecting...
Set Slow Write = true
[object Object]
Connected [object Object]
ERROR: RECEIVE ERROR: {"connectionId":1,"error":"device_lost"}­
Disconnect callback...
WARNING: [notify_warn] Disconnected
>>> Disconnected
ERROR: executeExpression called when not connected!