If you meet some sporadic flash problems with your EV100 Goggles and if you are not afraid to desolder and resolder a small chip, this toolkit will solve your problem: https://www.banggood.com/Eachine-Upgrade-Tool-Spare-Part-For-EV100-FPV-Goggles-p-1255405.html
After the installation of this chip, the last firmware is already pre-installed. You can find also in the associated zip file all the software required to flash a firmware….
Brand Name : Eachine
Item Name : Upgrade Tools for EV100
Can solve the flash screen problem
1 x USB Module
1 x Cable
2 x Soldering Chip