Are you on Virgin Mobile in the US? The list of One V RUUs is here:
Directory listing of http://www.htcruu.com/Primo
Make sure you have the post-OTA (1.00.00.0928) radio in HBOOT before trying this fix... there's another bootloop issue I saw after installing certain kernels (e.g., simon's Jellyboot5), so you could try installing the "SuperSlick1-0"
kernel if you already have the correct version (1.00.00.0521_2) of the radio firmware.