my phone is SoftBank 502SO X Performance using GENERIC GLOBAL 8.0.0 F8131 rom. i tried most of the fastboot commands i could find. everything just throws out "command not allowed" error except for reboot and getvar command. any help please? i also have OEM Unlocking turned on as well as USB Debugging and turned off MyXperia Find My Device. my bootloader is locked and the service code shows up with "no". i remember a few years back where i use this android 4.4.4 budget phone (also bootloader locked and will not be unlocked in any way) can do most of the fastboot commands (flash system/ boot/ recovery/ etc...)
if it cannot fixed in anyway, is there any rooting app specifically for android 6.0.1 - 8.0.0? i tried using kingoroot, kingroot. none of them can break through.
Any help would be appreciated.