Just tried to upgrade my bundle. It's not available thru their website or by chatting with the rep. Just said to call their business office. Sure, when I have a few hours to spare...
I did not find the upgrade available from the regular account website. But when I went to the linked fiosquantum50 site, they did indeed offer the $10 upgrade.
But when I clicked on the upgrade I get:
We Apologize For The Inconvenience
Thank you for your interest in FiOS Quantum.
The speed upgrade is not available to you at this time. See other product options.