Según el Change Log de Unrevoked, desde la versión 3.2 soporta Froyo:
Changelog
unrevoked3 has been through the following versions:
v3.22:
Fix for latest Incredible OTA.
New Mac OS X build infrastructure; let us know if it broke for you.
Switched to in-house reimplementation of rageagainstthecage for better reliability.
v3.21:
Perform validation of the 'misc' partition before we start to ensure that it's safe for us to root your phone
Changes timing of root process to make it more reliable (requires one extra reboot now)
v3.2:
Added support for Froyo builds on all supported devices (thanks to Sebastian Krahmer)
Added support for the CDMA Desire
Optionally disables security on supported CDMA devices
v3.14:
Added support for HTC Wildfire.
Updated to ClockworkMod Recovery 2.5.0.7.
v3.1:
Fixed “Communications with phone unexpectedly interrupted.” error occurring on Windows version.
Updated to ClockworkMod Recovery 2.5.0.1
Program sets su permissions even when su is present.
v3.0:
Add support for Droid Eris.
Add the ability to function even without root on all supported phones.
Updated to ClockworkMod Recovery 2.0.2.4.
Renamed to unrevoked3.
v2.1:
Added support for flashing a custom recovery image.
Updated to ClockworkMod Recovery 2.0.2.0 (2.0.2.1 on Incredible).
Removed Linux root requirement to run (Linux root may be needed if udev rules are not properly configured).
v2.0:
Mac OS X: Added support for 10.5, not just 10.6.
Added support for HTC Aria.
Updated to ClockworkMod Recovery 2.0.1.3.
v1.0: Initial release.
Si esto es así, ¿para que downgradear?