No it will not root 20c
Device Model and Firmware Supported:
LG Optimus G - All
LG G2:
D800 - D80010d/D80010o/D80010q
D801 - TMO, CLR, WND, VTR [all 4.2.2. firmware. 4.4.2 not yet.]
D802 - all 4.2.2 firmware. 4.4.2 not yet.
D803 - all 4.2.2 firmware. 4.4.2 not yet.
D805 - all 4.2.2 firmware. 4.4.2 not yet.
D806 - all 4.2.2 firmware. 4.4.2 not yet.
F320K (Shipping ROM)
F320K - F320K20a/20f
F320L (Shipping ROM)
F320L - F320L20b/20e
F320S (Shipping ROM)
F320S - F320S20a/20g
Sprint LS980 - All 4.2.2. 4.4.2 not yet.
Verizon VS980 - All 4.2.2. 4.4.2 not yet.
But in the the g2 AT&T development thread there are two ways for you to have kit Kat and rooted
Sent from my LG-D800 using XDA Premium 4 mobile app