Re: load ver.4 original firmware into ubitx ver.3


The v4 code has a different calibration scheme, which is actually pretty easy if you have a second receiver. The code is posted at:

You can get the needed Arduino IDE compiler for free at:

Using the Arduino IDE program, you can read the ubitx_v4.3_code.ino code, compile it, and load it into the Raduino with a USB cable.

While I now understand this, I'll admit the process was not so obvious when I started. Another "geezer" (AA4PG) posted some very clear instructions here:


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