tasmota 12.1.1 not working

[eyups]

hi,

I have similar module but rebranded to local brand called as Fonri. It is written Wifi_Flood_v6.0. 20171130 on it. I flashed tasmota successfully with different tools. When I run the module for configuration in serial monitor there is empty screen and nothing happens.

I checked if flash successfull by downloading the firmware in it but it seems tasmota was in it successfully. I also erased firmware and then flash it. Tried all of the tools but tasmota can not run on it. Also there is no wifi ap connection. It seems it doesnt boot the tasmota.

Any ideas?

Thanks,
Eyup