Yeah, I know, I have an old drone but I've lost the binding on my remote to drone/camera. When trying to reset, it reports : "Wi-Fi Repeater Connection Failed"
Seems like I cannot get beyond this point in an endless loop. Any suggestions from you experienced folks?

That's actually the camera that won't bind using the DJI app. The remote still works but we're blind!

Are you sure you're binding correctly?  Are you using the MAC address from the wifi module?  

IF so, sounds like your Range Extender failed?  But that's rare.  You can check it easily with a free wifi analyzer app.  See if it is transmitting wifi.  Then do the same with your drone.  

When all is said and done and the binding is perfect, you still likely won't have FPV because the NAND likely needs to be flashed, but that's a different problem.  

Good luck.  

The P2V+ is a stone age lump of junk, even if it worked properly.
Do yourself a favour, save the hassle and get something more modern and 10 times better.