Accidentally deleted D801 OS

I have a LG D801 running custom rom (cm-12-20150625-SNAPSHOT-YNG4NAO09M-d801) I went to flash the newest CyanogenMod nightly and accidentally wiped everything, ie, system, data, cache internal storage, etc. Doing this wiped the new rom I was going to flash as well as the backups i had. My phone is now stuck on the LG logo. I can get into TWRP and into download mode but the phone gets stuck at 'firmware update' when I do this. I downloaded the latest LG drivers and ADB drivers but my pc doesn't respond when I plug my phone in. Any help with this would be greatly appreciated.

D801 - Mobile Networks not working or too weak

Someone brought me an LG G2 D801 and I'm having issues to connect to mobile networks. I could a couple of times connect to LTE (with weak signal) but never to EDGE or HSPA. I've selected 'GSM only' and 'WCDMA only' options, entered the 3845*#801# menu, checked my APN settings... I also tried rooting phone and installing CM12.1, but the same behaviour persisted.

According to phone specs, this phone is compatible with the network bands available in my country (Argentina), so I'm a bit lost right now. I'm thinking on doing something with QPST or similar.

Any idea would be appreciated =)