for devices rooted with a test image

Download the fake-flash update zip from one of the links below

Copy the update.zip to the root of your SD card (the name MUST remain as update.zip)

Turn on your device with 'volume down' pressed and select 'Recovery'

When the exclamation mark appears, press and hold 'volume up' then press 'power'

Select the second option, 'Apply sdcard:update.zip

That's it, ClockworkMod recovery should launch!

This morning, Koush and I have been working on / stumbling through getting recovery running on a Desire without using a PC. The same technique also applies to the Legend. Presenting...Fake-flash using a similar concept to the original root method, it launches a recovery image from the test image recovery, but instead of pushing the files from a PC, the files are extracted from an update.zip on the SD card. Here's how it works...This is Recovery ROM which eliminates the need to have a PC to initiate Custom ROM loading process. Currently on a Rooted "Desire": you will need to put your phone in Recovery Mode (Power up phone while pressing Volume Down Key, then Select Recovery Option) and then Run a Batch file (eg. Recovery-windows.bat) from PC while phone is connected via USB Cable. This will put the phone on Customer ROM recovery/Loading Mode. Please check Paul's excellent methods found on MoDaCo. ClockWork eliminates this requirement of PC/Laptop.If you have/Downloaded ClockWork ROM (Latest is 2.0.1.4), you can always copy this on you SD Card as "update.zip". While in Standard Recovery Mode (Power up phone while pressing Volume Down Key, then Select Recovery Option) Press "Up" Volume Key and Power Button. You will get Standard Android Recovery Menu. Load the update.zip. Once you do this ClockWork will show you the Custom Rom Loading Menus. From there you could load Any Customer ROM stored on your SD Card.However, to make this simple, you should use ROM Manager Application which integrates everything together. With ROM Manager you could Select Custom ROM while the Phone is Running normally and Install them easily. To download ROM Manager and ClockWork ROM for different phones directly check:Neat eh?Just to caveat this initial release, we've yet to carry out extensive testing and you are constrained somewhat by the limitations of the stock kernel (e.g. no support for EXT4).That's it for now... enjoy... i'll update this post as further advances are made. If you'd like to support Koush's work, consider buying 'ROM Manager Premium' from the Android Market.