The proper commands to turn on/off the echo are ATE1 and ATE0, not AT+E1 and AT+E0
ATE1 and ATE0 now works in espressif firmware downloaded by AT+CIUPDATE
volatile comand : Echo ON after AT+RST
(AT+GMR gives 001800092 for this first 'cloud upfated' firmware)
Upgrades tested as shown here : http://blog.electrodragon.com/cloud-updating-your-wi07c-esp8266-now/
Browing bin shows downloading from 'iot.espressif.com/v1/rom....."