OPPO R15 Global RoM downloads are free from here without any password. The Flash File will help you upgrade, downgrade, or reinstall your Mobile Device’s Stock Firmware (OS). Furthermore, the Flash File (ROM) enables you to repair the Mobile device if it has a Software Issue, Bootloop Issue, IMEI Issue, or Dead Issue.
Oppo R15 CPH1819 PAAM00 EX 11 A.08 180411.zip is the file name.
4 GB file size
2ND FILE OF OPPO R15 Global Rom:
Oppo R15 CPH1819 EX 11 F.27 210409 RFT.zip is the file name.
5.36 GB in size
Flashing or Installing Firmware (ROM):
On the computer, download and extract the Oppo R15 stock firmware package.
You will be able to obtain the Firmware File, Flash Tool, Driver, and How-to Flash Guide after extracting the package.
Install the USB Driver that was given on the computer (if the USB Driver is already installed, then SKIP this step).
To flash or install the Firmware on your Oppo R15 smartphone, refer to the How-to Flash Manual.