Hi Johann.
I’m sorry for that issue.
Can you share what do you see when it gets stuck?
Regards,
Sara

Hi Sara
In the meantime i have done dozen of tests
I use three different ESP01.
I can flash AT-Firmware on all three modules.
I can download Arduino C++ Applications on three modules.
All the above works fine.
But if I try to flash the nodeMCU-Firmware “nodemcu-master 11…” as you mention on page 466 , in order to run LUA-Application on the ESP01, I allwas run in trouble. I get the MAC and it starts flashing, I see the progress bar. But after some seconds it stops and nothing happens.
I have also tried to flash the default INTERNAL://NODEMCU (page 466 top). I get the same result. After a while the flasher stops and nothing happens.
For some tests, I have used a separate power supply during flashing.
In the meantime a used also NodeMCU PYFlasher: same result. After a while it stops.
One could think it is broken hardware, but look:
I use three different ESP01.
I can flash AT-Firmware on all three modules
I can download Arduino C++ Applications on all three modules,
but never ever I get the nodeMCU-Frimare on any of the ESP01.
Do you have any idea whats wrong?

Hi Johann.
With what you described I can’t figure out what might be wrong.
The only thing that causes problems many times is the wiring. Make sure that GPIO 0 is connected to GND. But as you mentioned, you are able to upload other firmware.
It is also strange that you can’t make it using a different software. The only thing that can be wrong is the LUA firmware, but that’s improbable.
I’m sorry, but I don’t see what else can be wrong :/
 

Hi Sara,
of course GPIO 0 is on Ground, otherwise the flash process would not start. But it starts and runs a bit. I can see it on the progress bar. Could it be an temperature-issue or power-Issue? in some forum article i read about using a capacitor between GND und VCC. Others talk about using a separte power to flash?
And as i wrote. I use three different moduls form two vendors.
 
 

Hi
try
https://create.arduino.cc/projecthub/pratikdesai/flash-firmware-on-esp8266-esp-01-module-e1f758
software
https://drive.google.com/open?id=1tD7IpE4rPMOWyQHP6xzjdRKjJAyeEZPj
might work
 

Hi Sara, DK, thanks for your help. In the meantime I figured it out and it works now.
What was wrong? Basically it was a kind of cabling. I used a breadboard. In this i put the ft232 and an adapter for the esp. i guess I had to much interfaces for the flashing power of 500 mA. 
Now i use  cable from the FT232 directly to the esp, no breadboard, no adapter and it works fine. 
It was confusing, because as i wrote everythin else worked fine with the breadboard installation 

Hi Johann.
You’re right, it was very confusing. However, it is now solved.
I’ll mark this issue as resolved. If you need further help, you just need to open a new question in our forum.
Regards,
Sara