: The Qualcomm Snapdragon 665 chip features an Emergency Download (EDL) mode. Advanced developers utilize specialized hardware boxes (like Miracle Box or UFI Box) or custom firehose programmers to interact directly with the device's storage chips, bypassing the standard Fastboot restrictions to modify system partitions. Hardware Compatibility Profile
While the phone features a highly capable, development-friendly Qualcomm Snapdragon 665 processor , the lack of official bootloader unlocking tools means that traditional custom ROMs (like Pixel Experience or LineageOS) cannot work on this device using standard flashing methods . oppo a9 2020 custom rom work