Mr. Ed
Extreme Android User
I have seen a few folks ask about this so figured it deserves it's own thread.
I take no credit for this...other than finding it and posting it for ya.
Read it thoroughly..there was at one time an issue with the newer hardware that has the new partitions but that may have been corrected. You will have to research this to find out as I have no new phone to test it on. and follow the directions....all of the standard disclaimers apply.
FOLLOW THE DIRECTIONS...this was very easy for me to follow...but if you jack it up it will SERIOUSLY bork your phone.
Original from fredelement on xda
[GUIDE] HBOOT 2.10(.02 -?)[</3] Got you Down? - Get 0.76[<3] Back! - xda-developers
Find out your hardware version: From the home screen, (on a sense based ROM) go to menu > settings > about phone > hardware information, if you're phone is hw 004 don't even read this thread.
First of all, Thank You Joeykrim - I've been trying to do this forever (2 days) and my evo is so much happier now. You're awesome and Evo owners with BS hboots thank you.
DISCLAIMER: IF YOUR PHONE EXPLODES THAT SUCKS AND I'M SORRY BUT IT'S NOT MY FAULT, THERE'S ALWAYS A CHANCE ANYTHING CAN GO WRONG
If you're doing this on late hardware models 003/004 (with new partitions) then you should stop reading now and probably not do it. I'm not sure if the new recovery can fix up your stuff after you do this
This should also work on 2.02 hboots but I haven't tried it yet, please confirm if you give it a shot, if not I'll make another PC36IMG.zip just for you 2.02ers.
Second of all:
THIS WILL HURT YOUR PHONE (TEMPORARILY) - YOU NEED TO HAVE A RECOVERY INSTALLED BEFORE YOU DO THIS! YOU WILL NEED TO RE-INSTALL (NOT NANDROID) YOUR ROM! THEN RE-FLASH RECOVERY AND THEN RESTORE A NANDROID, YOU CAN PROBABLY DO THIS ALL IN BOOTLOADER BUT HERE'S WHAT I DID:
1) you have to be S-OFF, so at one point in time if you're on hboot 2.10 you would have needed to flash unrevoked-forever.zip, if you're not there yet follow this and get there: [ROOT][GUIDE] HBoot 2.02/2.10 SOFF - Goodbye Stranger - Upd. 02.25.11 - xda-developers
2) There are two files attached to this post: PC36IMG_210-76.zip - You need to rename this file to: PC36IMG.zip - This file is a hex edited version of the .76 hboot, it's been changed to 2.10 to fake the Evo in to accepting the update. The other file is the original .76 hboot in a zip that you can install via recovery.
Your first step, copy PC36IMG_210-76.zip to your SDCARD, rename it PC36IMG.zip, also at the same time copy Evo_hboot_0.76.2000.zip to your sdcard.
Second step, reboot in to fastboot, choose bootloader, when asked, apply the update, third step, hit NO to reboot your phone, select Recovery, from recovery go to install zip and pick the Evo_hboot_0.76.2000.zip. Reboot to complete the installation.
Next Step: My phone at this point, only booted straight to fastboot, I went to recovery and installed a nandroid and it didn't work so I had to install cm6.1.1 from scratch, reflash clockworkmod (was using RA) and then restore a different nandroid. - That is the long way home but when I got there I had my rom and hboot .76!
PC36IMG_210-76.zip
http://forum.xda-developers.com/attachment.php?attachmentid=470668&d=1293026281
.76 eng bootloader
http://forum.xda-developers.com/attachment.php?attachmentid=470669&d=1293026281
fastboot
http://forum.xda-developers.com/attachment.php?attachmentid=473650&d=1293384825
I take no credit for this...other than finding it and posting it for ya.

Read it thoroughly..there was at one time an issue with the newer hardware that has the new partitions but that may have been corrected. You will have to research this to find out as I have no new phone to test it on. and follow the directions....all of the standard disclaimers apply.
FOLLOW THE DIRECTIONS...this was very easy for me to follow...but if you jack it up it will SERIOUSLY bork your phone.
Original from fredelement on xda
[GUIDE] HBOOT 2.10(.02 -?)[</3] Got you Down? - Get 0.76[<3] Back! - xda-developers
Find out your hardware version: From the home screen, (on a sense based ROM) go to menu > settings > about phone > hardware information, if you're phone is hw 004 don't even read this thread.
First of all, Thank You Joeykrim - I've been trying to do this forever (2 days) and my evo is so much happier now. You're awesome and Evo owners with BS hboots thank you.
DISCLAIMER: IF YOUR PHONE EXPLODES THAT SUCKS AND I'M SORRY BUT IT'S NOT MY FAULT, THERE'S ALWAYS A CHANCE ANYTHING CAN GO WRONG
If you're doing this on late hardware models 003/004 (with new partitions) then you should stop reading now and probably not do it. I'm not sure if the new recovery can fix up your stuff after you do this
This should also work on 2.02 hboots but I haven't tried it yet, please confirm if you give it a shot, if not I'll make another PC36IMG.zip just for you 2.02ers.
Second of all:
THIS WILL HURT YOUR PHONE (TEMPORARILY) - YOU NEED TO HAVE A RECOVERY INSTALLED BEFORE YOU DO THIS! YOU WILL NEED TO RE-INSTALL (NOT NANDROID) YOUR ROM! THEN RE-FLASH RECOVERY AND THEN RESTORE A NANDROID, YOU CAN PROBABLY DO THIS ALL IN BOOTLOADER BUT HERE'S WHAT I DID:
1) you have to be S-OFF, so at one point in time if you're on hboot 2.10 you would have needed to flash unrevoked-forever.zip, if you're not there yet follow this and get there: [ROOT][GUIDE] HBoot 2.02/2.10 SOFF - Goodbye Stranger - Upd. 02.25.11 - xda-developers
2) There are two files attached to this post: PC36IMG_210-76.zip - You need to rename this file to: PC36IMG.zip - This file is a hex edited version of the .76 hboot, it's been changed to 2.10 to fake the Evo in to accepting the update. The other file is the original .76 hboot in a zip that you can install via recovery.
Your first step, copy PC36IMG_210-76.zip to your SDCARD, rename it PC36IMG.zip, also at the same time copy Evo_hboot_0.76.2000.zip to your sdcard.
Second step, reboot in to fastboot, choose bootloader, when asked, apply the update, third step, hit NO to reboot your phone, select Recovery, from recovery go to install zip and pick the Evo_hboot_0.76.2000.zip. Reboot to complete the installation.
Next Step: My phone at this point, only booted straight to fastboot, I went to recovery and installed a nandroid and it didn't work so I had to install cm6.1.1 from scratch, reflash clockworkmod (was using RA) and then restore a different nandroid. - That is the long way home but when I got there I had my rom and hboot .76!
PC36IMG_210-76.zip
http://forum.xda-developers.com/attachment.php?attachmentid=470668&d=1293026281
.76 eng bootloader
http://forum.xda-developers.com/attachment.php?attachmentid=470669&d=1293026281
fastboot
http://forum.xda-developers.com/attachment.php?attachmentid=473650&d=1293384825