Best practices:
Firmware for Android 8 (initial) and Android 9 (ColorOS 6) is no longer served via OTA but available in support archives. Firmware OPPO R15x
Oppo R15x * Screen: 6.4″, 1080 x 2340 pixels, Super AMOLED. * Chipset: Qualcomm SDM660 Snapdragon 660 (14 nm) * Battery: 3600 mAh, www.techindeep.com Oppo R15x - Full phone specifications - GSMArena.com Best practices: Firmware for Android 8 (initial) and