I read in the f.. manual :-) and found this:

> HM-10 Device Terminal Functions: PIN 11 | RESETB | Reset if low >100ms.




I googled and found this:

> 1.3.1 How to wake up module from sleep mode? There are two ways to wake up module from sleep mode.
> 
> 1) Send “I am iron man, I am iron man, I am iron man I am iron…..”
> string.
> 
> Yes, that is a joke, in sleep mode, you can send a long string (Length
> > 80 or more), that string can made module wake up, and you will receive “OK+WAKE” string through UART. That string can’t include any
> AT commands.
> 
> 2) Long press system KEY >=1000 ms.
> 
> After wake up module, you can send and receive AT commands.

find this here: *http://eezone.co.uk/blog/wireless/hm-10-cc2541-4-0-ble-bluetooth-to-uart-transceiver-module.html*

(system KEY on "real" HM-10 breakouts is BRK)