HTC Sensation 101

Downgrade HBOOT: http://forum.xda-developers.com/showthread.php?t=1399331

Links:
Revo:
http://revolutionary.io
GingerBreak:
http://forum.xda-developers.com/showthread.php?t=1044765
HTC Sync: (Install then uninstall)
http://www.htc.com/europe/SupportViewNews.aspx?dl_id=982&news_id=769

Written Tutorial

1. S-On or OFF and Essential info

Turn off your phone
Hold volume down and turn on
Read the bar at the top
Remember the text that says HBOOT, make sure it is 0.98.0000 or 0.98.0002 if not, dont go on.
Should say either:
SAGA PVT SHIP S-ON
or
SAGA PVT SHIP S-OFF
(exit with a battery pull)
If youre phone says s-off, skip to step 3
If not, keep reading

2. S-OFF with Revolutionary

Download Revolutionary (keep browser open)
Unzip the folder to a destination.
Run the exe and connect your phone.
Revo should provide a serial code, copy that.
On the website, fill out the form.
Operating System: Windows/Linux
Your device: HTC Desire S (or whatever)
HBOOT version: 0.98.0000/0.98.0002
Serial Number: What Revo provided earlier

Now Click generate Beta Key
Copy and paste that into Revo
Press enter and wait whilst your phone is S-OFF'd!
!IMPORTANT!!
MAKE SURE YOU FLASH CLOCKWORK MOD WHEN REVO ASKS OR YOU WILL ENCOUNTER PROBLEMS

3. Root
Two Possible methods
1. Install su.apk (stable)
2.Gingerbreak(easy but unstable)

Option 1.Install su
Download the su ZIP: http://goo-inside.me/superuser/su-2.3.6.3-efgh-signed.zip
Copy the zip to the root of the SD Card.
Enter clockworkmod
i.Turn off
ii. Hold down volume and turn on
iii. select recovery
Now select install zip from SD
Choose su-2.3.6.3-efgh-signed.zip
Wait, then reboot.

Option 2. GingerBreak
Download this on your phone: http://bit.ly/rootdesires
Install the apk
Run Gingerbreak and tap Root.
Reboot

Next Step?
Install a custom ROM!
http://www.youtube.com/watch?v=vQZHOq72HP8

Have an iPhone?
Then Take a look at these: http://www.youtube.com/playlist?list=PLCBE9244566CDFF04

Have a PSP?
Then take a look at this: http://www.youtube.com/watch?v=iefdwPv-zZo

Thanks to forum.xda-developers.com for this exploit!