On other threads, it's been stated that one of the later colour os updates allowed unlocking of the bootloader and one user seemed to get it working?
"flash with .zip via install storage, zip flashable, fill it with emmc_appsboot, if you are having trouble getting through Qfill, I've tried oppo and the bootloader is disabled, and it works..."
I've never had to deal with a locked bootloader like this so any help is appreciated. the amount of bloatware on this thing is unbelievable.
Genuinely appreciate any insight <3