The soon to be released Froyo update for the ThunderBolt has leaked and is available for download. Hopefully, this is the last of the Froyo updates and that an official Gingerbread release is next.
Do NOT load if you have rooted your phone.
[RUU LEAK] Froyo 1.70.605.0 Radio 1.39.00.0627r - xda-developers
Do NOT load if you have rooted your phone.
[RUU LEAK] Froyo 1.70.605.0 Radio 1.39.00.0627r - xda-developers