The latest firmware for LG Cosmos (LG vn251) is vn251zv3.
The lg cosmos vn251zv3 software was released by lg official in Jan 2013.
For those who missed the vn251zv3 software update, You can use the LG Mobile Support tools to download and install this vn251zv3 software update.
To downnload vn251zv3 firmware for LG Cosmos (LG vn251):
visit http://lge-phones.org/check-latest-lg-official-firmware. Follow the on-screen instruction to downnload vn251zv3 firmware.