Another lg g2 bricked

So this is not my first time bricking my lg g2 ls980, I know I can go and flash the stock firmware but this time I don't want to lose the files on it because I have some important ones, the thing is my phone have the recovery 'secure booting error' and I CAN boot to download mode, I was using the rom 5.1.1 ressurection remix but I decidec to switch to cloudy g3 3.3 and when I tried to install the kk bootloader using a tool (this one: http://forum.xda-developers.com/lg-g...kk-lp-t3104380) I didn't check a thing in the end (I don't remenber at all but I think it was to flash a custom twrp to prevent what happened to me) so now I have really good looking useless phone. (I have a nandroid backup on the phone too to prevent any problem except the one with the twrp :( )

I just want one of these 2 thing:

1-being able to flash a working twrp recovery via download mode or somehow (I really don't care the how)
or
2-A way to recovery my files before flashing the stock firmware

I know I may sound greedy but I really need those files and I know if I can do one of the 2 methods above, I'll be able to get those files.

Thanks in advance.

ps: if need more specific information, don't hesitate to ask