08-07-2018 12:49 PM
If you're using Windows you can use third party data recovery apps such as Recuva by Piriform.
Don't know if Mac has a data recovery tool as well.
By the way GoPro is not affiliated with Recuva/Piriform.
The chance of recovering your file is not 100% guaranteed.
08-07-2018 02:14 PM
There might be a way but it might need a lot of effort to recreate that rather than recovering them.
I'll check if I can recreate LRV file and will share it here.