1. Download Nougat 7.1.1 Lineage OS for Oppo Find 5
Android 7.1.1 Nougat is a major update so, it is required by the Lineage Team to connect your Oppo Find 5 to a Wi-Fi network to be able to download the ROM with high speed.
Download Lineage OS for Oppo Find 5
2. Download Nougat Lineage OS Gapps
Since, you are interested to update your Oppo Find 5 to Android 7.1.1 Nougat using a custom ROM as it is Lineage OS ROM you need to download and flash Google Apps in order to be able to use any Google services.
Download Nougat Lineage OS Gapps
3. Install Lineage OS on Oppo Find 5
How to Install Lineage OS on Oppo Find 5?
Firstly, using the buttons from above you need to download both the Lineage OS ROM and Lineage Gapps from above and transfer or save them to your phone’s internal storage.
Then, power off your Oppo Find 5 – and wait while the shut down process is fully completed.
Good; now boot Oppo Find 5 into TWRP Recovery mode using your preferred method.
Now the first thing you need to do once, you are into TWRP Recovery main menu is to perform a factory / hard reset. From the TWRP main menu tap on the wipe button and swipe to the right side to complete the operation.
After doing so, tap on the install option from the TWRP main menu and load the Android 7.1.1 Nougat Custom ROM file.
This time repeat the last step from above but install Lineage OS Gapps package.
When done, go back to main menu of recovery and reboot your Oppo Find 5.
Congratulations; These were all the steps that you had to take in order to learn how to properly install Lineage OS on Oppo Find 5 based on Nougat 7.1.1 Update.