DINC Update HBOOT and Radio - bibanon/android-development-codex GitHub Wiki
Since downgrading to Froyo also downgrades the HBoot and the Radio, you will want to flash the new version back in for more features and stability.
Download both files below and flash them both. One is the hboot, one is the radio.
PB31IMG-4.08.605.15-hboot-1.07.zip md5: db019de010ae8ef6a2c250fd8b378ba1
PB31IMG-4.08.605.15-radio.zip md5: cb8b3ac72c0ae13e1f088b302135bd58
Boot your phone to mode (see Things to Know), and run the commands below:
fastboot devices fastboot erase cache fastboot oem rebootRUU fastboot flash zip your-zipfile-name-here.zip fastboot reboot-bootloader fastboot reboot
Repeat this process for the other zip file. Once you've finished that, you're now ready to get some custom ROMs.