I was de-pinning my FC because I wanted to switch from straight pins to angled pins.  I've always been bad at doing this and was struggling with the PPM (CH1) spots when the actual metal hole came out of the FC.  Now it's just...whatever material the FC is made of.  
Is this fixable?  Is there any way to change what channel the PPM input is on?
The FC is a Flip32 (v 2.6_Rev7).  It's been a great FC for only $15.  I already bought a replacement, but I'd like to know if this one is salvageable.

If you still have some copper on the signal side, like on the picture, than you can solder a pin to it.
If all the copper is gone around the hole, then you can try to pick up the signal and solder a wire between the pin and the pad on the PCB, but that is only possible if you know how to solder.

Unfortunately, the Flip32 only has 1 UART for serial rx, so it won't work unless you used pwm or spectrum input. At least it was only 15 bucks! If you have to do this again this is what works for me. First yank off the black plastic sepatator blocks so you can remove one pin at a time. Hold the board so the long part of the pin is underneath. Nice hot soldering iron placed on the short stub of the pin and it will just drop out. The hole might seal up again so you'll need some solder wick or a solder sucker to clean it up

Simple fix!

Remap the resource to a different pin, thanks to betaflight 3.1

In cli simply type "resource" to see each pin selection and the corresponding physical location.
Then switch an unused resource with your damaged one (etc switch 1 and 5).

Assign one resource to none (etc "resource MOTOR 5 none") and then assign the unused id to your damaged output (etc "resource MOTOR 5 A12") and problem fixed.  For a more detailed explanation there is a Joshua Bardwell video on it for any specifics .
This exact same thing happened to a friend a couple days ago

Oh snap! If that works that would be amazing.

Renov8r, yeah it's always getting that last little bit to unseal the hole that screws me over. I can never get it out with a solder sucker or with a wick. This is actually the second FC I've burned out trying to de-pin....

I'll have to try what you suggested tonight Gryffin. Hope it works with PPM inputs!

I've actually got this long sewing needle that's the same diameter. When I've removed all the solder I can, I just put my soldering iron on the hole and stick the needle in and ream it in and out. Seems to clean it out enough that I can get new pins in

@Gryffin, that worked perfectly!

Thank you so much!