So, for those of you, who do NOT care about root for now, here's what worked for me:
1.: Download the zip-file with the OTA Update, mentioned on the first page and extract it.
2.: Connect your Hero to your PC and copy the recovery.img from the OTA onto your sdcard. Disconnect from computer.
3.: Boot your phone into the bootloader (Home + PWR).
EDIT: Now connect the phone to the pc again!
4.: open the command prompt of your pc, navigate to your Android SDK folder. (If it is not installed, download it and make sure you've got the needed drivers. Otherwise: Download them, using the Setup.exe from Android SDK)
5.: Here are the needed commands:
flash_image recovery /sdcard/recovery.img
6.: reboot your phone after exitting the command prompt.
7.: Factory reset, reboot again
8.: And well, wait for the update-window again and be happy, now it should work
Any questions? Just leave a reply