Issues have been noted with CMW, resulting in a corrupt file system every time you format a partition (or clear cache). Similar (but not quite as bad) issues have been noticed with TWRP. The "official" fix is to install the latest version of whatever recovery you prefer CWM6 or TWRP 22.214.171.124 (via Goo Manager), create a backup in recovery, then use Acmeuninstaller to remove Android and reinstall CM9 or CM10 with the same recovery version, then restore your backup.... (I know, a lot of work.) There's a pretty good guide to install (or uninstall) anything here: How to install jcsullins CM10 Unofficial Build 20121211, with Sound, Camera & Microphone, Updated 12/13/12 - HP Touchpad - RootzWiki Bear in mind that CM10 is not officially endorsed right now (it's still in the preview status). So even tho people like me are using it without issue, and it's expected to make "nightly" status before long, there could still be issues requiring you to return to stock and start over. If you always used Acme installer to install CM9 OR if you never used recovery to clear the cache or install anything, you might be ok by just updating your recovery. Whether you go the official route (or just run Acme3 with an empty cminstall folder and take a risk of corrupting your install like I did ), you should at least be on the latest recovery. Bear in mind that some versions of CWM and TWRP only work with backups created with the same version of recovery, which is why the "official" route says to update to the latest recovery, create a recovery backup and later restore it with the same version. Note: backups created by TWRP and CWM cannot be restored by the other (CWM/TRWP) program. CWM6 can be installed by flashing it from recovery, and TWRP 126.96.36.199 is available in Goo Manager (tap the menu button and choose "install openrecovery script"). If CWM is installed, TWRP usually replaces it.