Verizon model is protected from flashing unsigned/modified boot.img and recovery.img. Which means there is no known root method as for now for SCH-I535.
Stay tuned for more informations as we are doing research now.
Rooted stock boot.img issue:
<ID:0/008> Firmware update start..
<ID:0/008> NAND Write Start!!
<ID:0/008> FAIL! (Auth)
CWM Recovery.img flash issue:
Research status: 10%
<ID:0/003> Firmware update start..
<ID:0/003> NAND Write Start!!
<ID:0/003> Complete(Write) operation failed.
News about locked Verizon model is spreading over the websites and main tech-related portals. Hopefully we will get some detailed info soon.
It looks like it has been rooted by using system.img trick (system.img is not signed)
Enjoy! and thanx to invisiblek