Hey,
I have a Galaxy S3 w/ AT&T, so rooting my phone was no issue,
HOWEVER, my girlfriend, who wants my help rooting her phone, has Virgin Mobile's Galaxy S2 Epic 4G Touch variant.
She is currently fully stock and purchased her phone shortly after Christmas, it came with the FL26 version of ICS, but I haven't found anything around in terms of rooting or getting a custom recovery of her version of the phone.
I'm not exactly sure how having the FL26 Kernel you are providing helps me, BUT, your post is the only one I've seen anywhere that even acknowledges anything about FL26. Would you know how to root the phone? I just want a rooted stock version of what she has. I definitely don't want to see a Sprint boot-screen since she has Virgin after getting root, but I don't mind if I end up getting a triangle.
From what I know, clockworkmod custom recovery has ended bricking some of these devices, so root or not, I can't back up her stock rom to go back to in case her phone gets bricked somehow. This has left me in a pretty vulnerable position, and I'm not sure what I can do. Any info would be appreciated, and may help in my girlfriend removing my balls from the vice she has them in...
The phone details are as follows:
Model Number: SPH-D710VMUB
Android Version: 4.0.4
Baseband Version: S

710.10S.FL26
Kernel Version:
3.0.15-1135978
se.infra@SEP-118#3
SMP PREEMPT Wed Dec 26 13:48:32 KST 2012
Build Number: IMM76I.FL26
Hardware Version: D710.10