ESP8266 Community Forum

Please disregard above post.

ESP07 programs OK as 1M module.

will take the can off one of them to physically check the flash memory.

Bingo!
Flash chip is a 25Q80 from Bergmicro . It is a 07 AI-THINKER.

http://www.esp8266.com/viewtopic.php?p=35271

Hello, you must use 1M to flash the esp-07 from Ai-Thinker it has 1024kbit for Data, the Chip is a "25q80assig" from BergMicro. - See more at: viewtopic.php?p=35271#sthash.DBP2kUFB.dpuf

Are there any known issues or limitations in running V3 ESP Basic in 1M of flash ?

None that I am aware of. Have it running on several 1MB devices currently not to say that you will not find bugs but for what I do it does the trick. I am not entirely sure if OTA will work on a 1mb flash it may because the bin is less then half of the size but if it does count on it not working in the future. You can rework a new flash memory chip on there though if you wish to have larger capacity but for now it should be perfectly fine to be honest for most applications.

Good luck and take care!

Thanks Forlotto.

I am only looking at using this as small sensor and control nodes in a network, so will not run a lot of code.
I do have 4M flash chips, its not too difficult to pop the metal can off and replace the flash.