i found a fix!!
the problem in wifi module from older versions is the memory!!
(same problem like me on monday)
my phantom 2 vision + was working fine!!!! untill i not used it for a long time.
telemetry and worked and i could move the camera.
BUT NO IMAGE ON THE APP. THIS WORKS!!!!
so the fix comes for 1.38 EURO!!!! instead of buying a new wifi module
and you need some soldering!! and steady hands!!
see discription here:
DJI Phantom 2 Vision+ Plus Blank Screen Corrupt NAND fix
here they use a Tinksky FT232RL FTDI USB2.0 to TTL Serial Converter Adapter ,
i used a different from ali express:
FT232RL FT232 USB to TTL 5 V 3.3 V
new 1PCS FT232RL FT232 USB TO TTL 5V 3.3V Download Cable To Serial Adapter Module For Ardui USB TO 232 in new 1PCS FT232RL FT232 USB TO TTL 5V 3.3V Download Cable To Serial Adapter Module For Ardui USB TO 232 van Geïntegreerde Schakelingen op AliExpress.com | Alibaba Groep
so i used 3.3V for the jumper (on the ttl adapter) and you dont need 12V + ground on the bottom connection like on the picture here.!!!!!!!!
be aware (that the connection on every ttl module is different!!!) TX GOES ON RX
AND TX GOES ON RX!! 5V and GNRD you also need to connect!!
follow the instructions in the link.
and you are back with live fpv!!!!!
good luck!!