Test your SD cards to see if they really have the amount of storage they say they have.
Based on F3.
To download the latest release, click here.
To test a SD card, make sure It's inserted, select It and click "Start Test". The test can take several minutes depending on the size and speed of your card.
The only steps required before you build is to pull down the code and submodules:
$ git clone --recursive https://github.com/insidegui/F3X.git