It takes only about an hour from the previous version release, Corona Untether 1.0-4 to fix iBooks crash, and looks like everything is responded in a quick manner, to which every single bug or error found will be dealt with quickly.
Why this update is needed? Because some users don't realize that they must reboot their devices once they have installed Corona package, for the untether to takes effect. Therefore forcing to reboot is needed. This has made the 1.0-5 update only brings minor update to backup the previous version.
Anyway if this is your first time hearing Corona or never jailbroke your iOs device using it before and want to download this Corona package and then install to your iOS 5.0.1 device, then please untethered jailbreak your iPhone using Redsn0w (Redsn0w 0.9.10b4) first and afterward, follow the guide to install Corona via Cydia.