Yesterday using the Web Installer I was able to program the Heltec Module V.2.1 with FW version 2.0.6
Today after I programmed another Heltec Module V.2.1 with FW version 2.0.6 I just got a blank screen.
I tried Programming it with FW version 2.0.5 and it worked fine.
Has anything changed with version 2.0.6 or the Flasher since yesterday?
There was an issue with the zip file for 2.06 that the web installer uses that was fixed yesterday I believe which is why you were able to today. Note that while the firmware files are still created, they are not officially supported anymore.