BTW, ESPRESSIF seem to have a firmware, the ESP-WROOM-02 Series that should fit the ESP8266 according.

https://docs.espressif.com/projects/..._binaries.html


It looks very easy to download the firmware to the module since one can choose between multiple .bin files (for the "experts" I presume) or a single .bin file (for th rookie I am )

The download process runs well with the ESP8266 FLASCH DOWNLOAD TOOL v3.9.5 but once the download is done, an error will always occur - must be some data copy check that doesn't accept the final result.

So, still stuck and searching....