HTC Espresso: T-Mobile myTouch 3G Slide

fastboot and recovery

Code:
power off the phone

hold volume down + power (phone should boot into white screen with 3 android skaters)

phone will load ESPRIMG.zip

when it asks if you want to update, press volume up to move to yes and press power to select. (if it does not ask you to update, you may need a different version of ESPRIMG.zip)

wait.

when the update is complete the phone will ask you to reboot. use volume keys to choose no and press power to select.

use volume keys to move to recovery and press power to select. the phone should reboot into a black screen with a red triangle.

hold up and press power.

use the volume keys to move to apply update.zip and press power to select. this will take you to clockwork recovery.

(once in clockwork recovery, use trackpad to navigate menus)

go to nandroid and push trackpad to select. perform a backup. press back to go to main menu.

go to wipe and push trackpad to select. perform wipe (factory reset). press back to go to main menu.

go to install zip from sd card and push trackpad to select.

go toto choose zip and push trackpad to select

go to update-cm-6.0.0-Slide-RC1-signed.zip and push trackpad to select

repeat the same process for gapps

when gapps is done reboot the phone
clean up (after the phone boots)

Code:
remove update-cm-6.1.1-Slide-signed.zip from sd card (optional. if you want to reflash the rom, keep it)

remove gapps-mdpi-20110301-signed.zip from sd card (optional. if you want to reflash the rom, keep it)

remove update.zip from sd card (optional. if you softbrick the phone, you will need this to get into clockwork to do a nandroid restore.)

remove ESPRIMG.ZIP from sd card

run rom manager and hit flash clockworkmod recovery (ensures that the phone will boot into recovery without update.zip on the sd card)

in rom manager, hit reboot into recovery

scroll down to nandroid and perform a backup.

once backup is finished, scroll down to install zip from sd

again, go to install zip from sd and choose radio.zip to install the radio.

once the radio is finished, reboot the phone and wait. The phone may reboot itself a couple times and show screens that look worrying, as though the phone is unable to find an image to boot from. Be patient and do not turn the phone off.

Test wifi connectivity and make sure both uploads and downloads work well. If you experience issues with wifi connectivity, refer to this thread for a possible solution.

enjoy your device!