Hello.
These boards are widely spread under the name "ESP-01 S".
Please remember, that the RAM chip used (W25Q80) has 8 Mb (Mega
bit), not 8 Megabyte.
Use the 1024 binary for flashing.
Even some older ESP-01 were delivered with 1 MByte (8 Mbit) but that never
worked out well for me, i allways had to Flash a 512 binary. It looks like they use
a strange way to split the memory into two 512 KB blocks.
Anyways I have some ESP-01S running with 1 MByte,
some like these ones:
http://www.ebay.de/itm/ESP8266-ESP-01S- ... SwjDZYmttd
Works without any issue for me.
Regards
Shardan