I have an EVO 3d on boost. S-on, hboot 1.50.
These I have flashed, with no issues, s-on:
I post these, not to promote one vs another, only to say I have used these, with no issue.
Smooth criminal- very good, stable ROM. For sure a daily driver. Everything works.
InbreddedRom-slick, red theme. Also stable. Everything works. Will need to flash the ROM zip, then the anthrax kernal to get it to boot. Otherwise, bootloops. I prefer the 4.x.x version. There's a 5.4 n 5.5 version too.
Viper 3d redline 2.5- also very nice. Simply flash the ROM zip, then superuser 2.3.2.6-efgh (I think that's it), then reboot. Currently running this one.
Any questions, get ahold of me, ill do what I can. But, as of now, these 3 worked for me, didn't lose flash.
Btw, I'm using 4ext as a recovery.