New to G3, please help!!!!!

Hi guys, i have been on these forums for a few years now but i've always dealt with Nexus 6 or samsung products. I laid my hands on a Verizon G3 but i use T-mobile. I have no problem getting it to work on T-mobile but what i do need help with is upgrading the device.
Yesterday i used the IOROOT process to root the device and i used flashify to install TWRP, but then i downloaded a couple custom roms and when i wiped and tried to flash in TWRP i got an error telling me that i don't have the 23c or 24b baseband. After this "issue" i got introduced to using kdz files to restore the device back to stock 10b.
After i did that i tried to manually update this G3 to 23c or 24b but i can't figure it out. I tried downloading the 24b.zip from AFH and flash it in TWRP but that didn't work, so i'm not sure if i was doing it properly. I tried using the device on wifi to do an OTA update but it said i have the latest software, which i know i don't. then i downloaded the LG Update Tool and ran that and got the same issue claiming that i have the latest software for the phone......
Can someone please tell me what i have to do to get this phone updated to 23c or 24b so i can get back to being a crack flashing addict?

thanks