ESP8266 Community Forum

Posted: **Tue May 05, 2015 12:24 pm**

http://www.cnx-software.com/2015/05/05/ ... certified/

Espressif, the company behind ESP8266 (EX) Wi-Fi chip for IoT applications, has now opened store on Taobao, where they sell WROOM-02 and WROOM-02 modules based on ESP8266EX with FCC, CE, TELEC, and SRRC certifications. The FCC ID is real - it is verifiable in the FCC database.

These are showing up on Aliexpress occasionally at $10, but $3.22 is the real price. Maybe someone will buy 1K and resell in US and EU.

Posted: **Tue May 05, 2015 3:02 pm**

a few of us in the community were given a WROOM-01 by espressif and they simply do not work - even espressif don't seem to know how to use them.

you can flash firmware ok, but they do not boot afterwards. the assumption is they have a locked bootloader (as they were made for a "special client") and don't accept custom firmware.

so before you get excited and buy any, get espressif to document and demonstrate how to get them to boot custom firmware.

see also viewtopic.php?f=13&t=2669

Posted: **Tue May 05, 2015 6:05 pm**

They have 2Mb flash chips on them instead of the normal 512Kb.

Posted: **Tue May 05, 2015 6:08 pm**

CNX posted the datasheet
https://download.cnx-software.com/publi ... fb15db04ca

I don't believe the ESP8266 supports locking the bootloader, more likely the problems stem from the 2Mb flash chip.

ESP8266 Community Forum

FCC approved WROOM module directly from Epressif, $3.22 Q1

FCC approved WROOM module directly from Epressif, $3.22 Q1

Re: FCC approved WROOM module directly from Epressif, $3.22

Re: FCC approved WROOM module directly from Epressif, $3.22

Re: FCC approved WROOM module directly from Epressif, $3.22