Task29 wipes the RAM on your device.
Reason for using it --
When flashing custom ROM's, you will find after a lot of flashes that things are buggy. You can help most of these bugs disappear when you do a clear storage. However, after many flashes, clear storage doesn't seem to clear all bugs.
When you flash a ROM, you overwrite the data on your RAM chip with new data. Sometimes data that might be on a block in one ROM may not exist in another ROM. As a result, since the data doesn't exist in the second ROM, you don't overwrite it. That data interferes with the new ROM. Clear Storage attempts to wipe all the data off the chip, but not all of it. There is still some data left
A Clear Storage clears more data then doing a Hard Reset with the button combo.
Both methods clear all data.
Since stuff still can be left behind even after a clear storage, you sometimes need to flash your SP's (Service Providers) Stock ROM. The stock RUU goes through Task28 before the flash. Task28 clears FATFS (storage memory), Task29 clears BINFS (where our XIP is and the files we cooked in to a rom). So technically, flashing stock is even better then this..
So Task29 wipes every single block with blank data. After running Task29, you should not be able to boot past the splash screen! Since you wiped the entire chip (instead of overwriting with a different ROM)
After doing Task29 establish an active-sync connection by going into bootloader from power off by pushing and holding Power+Volume down until you see the tricolor screen then connect your phone to your PC, wait till it says USB on the bottom, flash as normal.
An alternate method would be to place the raphimg.nbh (orginally named ruu_signed.nbh) on the root of the storage card and go into bootloader using above method.
Task29 runs from a RUU just like a custom ROM/Radio. It needs to flash something, since we don't want to use a ROM, we can use a Radio or a Splash Screen.
Flashing with Splash screens are much safer
You need to be HSPL Unlocked in order to do the flashing just like when you flash custom Roms/
Here are links to the files strictly for Touch Pro CDMA
Task29 which uses the Sprint Radio for flashing
http://www.4shared.com/file/9ndoxw8G/task29_Sprint__v11234F.html
Task29 with no NBH
http://www.4shared.com/file/pLbi81kA/task29_no_NBH.html
Task29 with Spash Screen
http://www.4shared.com/file/DvD23y2i/task_29_with_splash_screen.html