The later firmware updates brought genuinely useful features:
If you are experiencing minor glitches rather than a total boot loop, you can often avoid a full reflash by using the Official Oppo Support Factory Reset method to clear the cache and data first. Firmware OPPO R15x
By following this guide, you can ensure that your OPPO R15x firmware is up to date and that your device runs smoothly and efficiently. - xbl / xbl_b - abl / abl_b
Firmware for India, Indonesia, Australia, and China are not interchangeable due to different LTE bands and pre-installed apps. Firmware OPPO R15x
- xbl / xbl_b - abl / abl_b (ABL bootloader) - aop / aop_b - tz / tz_b - hyp / hyp_b - modem / modem_b (Baseband) - dsp / dsp_b (DSP firmware) - boot / boot_b (kernel + ramdisk) - dtbo / dtbo_b (DT overlay) - vbmeta / vbmeta_b (AVB 2.0) - system / system_b → merged into super (dynamic) - vendor / vendor_b → merged into super - product / product_b → merged into super - odm / odm_b - userdata - cache - misc - persist - frp (FRP partition)