CM9 nightly is the latest upgrade for the HTC touchpad users. Now a days, CM9 nightly support is considered a milestone in most of the devices, as the CM9 nightly transforms the phones into beta and is considered as most stable versions of CM9.
For the people who don’t know about the nightly upgrade, nightlies are ROMs that are automatically compiled each night featuring all the new code and changes made each day. Nightlies have some drawbacks too as they are automatic builds, they might introduce new bugs in the phone.
Nevertheless, if having the latest ROM is your main concern then nightlies are just the thing for you. Before going ahead with the upgrade remember that CM9 is still under development, few things might not work as expected, and you may encounter some bugs and issues.
CM9 Nightly ROM can be installed on the HTC Sensation in few easy steps. All you need to do is prepare a backup of your phone and of the APN settings so that if the upgrade does not go well you can always restore your phone. Next step is to download the latest version of the ROM from the XDA forums to the SD card. Boot up the phone in Clockworkmod recovery mode and perform a Nandroid Backup for your existing ROM, so that you can always restore it from recovery if something goes wrong with the latest ROM.
In the next step, you need to wipe all the data by doing a factory reset and install the zip files downloaded from the development site xda. You are almost there with the new version, just follow the steps and once the upgrade is completed the phone will reboot.
Remember that this ROM is compatible only with the HTC Sensation and not with any other device. All the above steps are considered risky, so be very sure before attempting anything new unless and until you are not sure as it might harm your device.