ROM： OnePlus2 OxygenOS v2.0.0
Release date: 2015/8/4
Make sure that your phone can boot and work normally. Then you download the firmware here.
Make sure that the battery capacity is above 30% and the available internal storage is above 2GB.
2. Upgrade steps
(1). Download the firmware package.
(2). Decompress the file, Copy the zip. file named “OnePlus2Oxygen_14_OTA_002_all_1507251956_wipe” to your OnePlus 2.
(3). Power off, then press the “Volume -” and “Power” buttons together, release them after a vibartion.
(4). Choose language.
(5). Select “install from SDcard”
(6). Choose the ROM you need, click OK to start upgrading.
The phone will reboot to finish upgrade.