I can't get started. Flashing seems OK, Espruino Web IDE not connecting.

I have the same problem and spent 2 days for solve it, but no results at all.
I tred

esptool.py --port COM3 --baud 115200 write_flash --flash_freq 80m --flash_size 4MB-c1 --flash_mode dio 0x0000 espruino_2v04_esp8266_4mb_combined_4096.­bin

and

esptool.py --port COM3 --baud 115200 write_flash --flash_freq 80m --flash_size 4MB --flash_mode dio 0x0000 espruino_2v04_esp8266_4mb_combined_4096.­bin

but have the same results.
Flashing Ok, Putty connection Ok, but WebIde connection is really bad. I have garbage text and error message :(

Board: 2AL3B-ESP-F (RoHS ESP-12N)
Baud rate was checked twice, I also tried to use ESP8266Flasher and FLASH_DOWNLOAD_TOOLS_V3.6.4 but the same result.