Hi Alaya, and welcome to AF 
I believe 1.09 is the officially unlockable bootloader for CDMA devices. Does it say "locked" at the top of the hboot screen? That indicates that the bootloader is unlockable.
If so, neither revolutionary nor unrevoked will work. The hboot downgrading tool I'm aware of is for GSM, so should absolutely not be used on a CDMA handset.
So that leaves 2 options:
1) Try to find a downgrade method that is safe on a CDMA handset. Be careful, as messing with hboots is one of the few ways you can really brick a Desire.
2) Use the official bootloader unlock.
The second won't give you full S-Off, but should let you flash a custom recovery, which will then allow you to root your ROM or flash a custom ROM.
To do this, go to HTCdev.com and follow the instructions for unlocking the bootloader. You don't need to update your software if you have 1.09, so ignore any stuff about running an RUU to update the phone. The site will tell you how to generate and load an unlock key (you'll need fastboot set up on your computer to do this - they have instructions there, otherwise this guide links to instructions on how to do this). Unlocking will perform a factory reset, which means that it's important to back up any important data before doing this.
Once the bootloader is unlocked you can follow the steps in this guide for downloading a compatible custom recovery, flashing it, then using it to root the ROM. Basically the bootloader unlock does what revolutionary does, just a little less completely.
The main differences between this and revolutionary (S-Off) are that you won't be able to fastboot flash radio or hboot (but there are few CDMA radios and no custom hboots for CDMA, so that's less of a restriction) and won't be able to modify /system while running android (so uninstalling unwanted system apps is more work). But it will let you do most stuff.
I believe 1.09 is the officially unlockable bootloader for CDMA devices. Does it say "locked" at the top of the hboot screen? That indicates that the bootloader is unlockable.
If so, neither revolutionary nor unrevoked will work. The hboot downgrading tool I'm aware of is for GSM, so should absolutely not be used on a CDMA handset.
So that leaves 2 options:
1) Try to find a downgrade method that is safe on a CDMA handset. Be careful, as messing with hboots is one of the few ways you can really brick a Desire.
2) Use the official bootloader unlock.
The second won't give you full S-Off, but should let you flash a custom recovery, which will then allow you to root your ROM or flash a custom ROM.
To do this, go to HTCdev.com and follow the instructions for unlocking the bootloader. You don't need to update your software if you have 1.09, so ignore any stuff about running an RUU to update the phone. The site will tell you how to generate and load an unlock key (you'll need fastboot set up on your computer to do this - they have instructions there, otherwise this guide links to instructions on how to do this). Unlocking will perform a factory reset, which means that it's important to back up any important data before doing this.
Once the bootloader is unlocked you can follow the steps in this guide for downloading a compatible custom recovery, flashing it, then using it to root the ROM. Basically the bootloader unlock does what revolutionary does, just a little less completely.
The main differences between this and revolutionary (S-Off) are that you won't be able to fastboot flash radio or hboot (but there are few CDMA radios and no custom hboots for CDMA, so that's less of a restriction) and won't be able to modify /system while running android (so uninstalling unwanted system apps is more work). But it will let you do most stuff.
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