Download Details
Software Name: BlackBerry Handheld Software v7.1.0.2930 (All Languages)
File Name: 9900AllLang_PBr7.1.0_rel2930_PL5.1.0.701_A7.1.0.1098_O2_UK.exe
Download Size: 282 MB
Language: English
Published Date: 10/25/2013

Screen shot from Desktop Manager software for PC

9900/7.1.0.1098
As usual, always backup your BlackBerry device prior to performing any install, either an official or leaked OS.
Also, pull your battery at least 3-4 times throughout the day to give the OS time to settle in.
Sincerely,
Guido DR @furiousguido