If a rom 26S does not block bootloader it is because it is a custom rom 26S.X722 brick can not unbrick now , becaus can not file QFIL , but if your phone can work now , please you downgrade to 20S and flash to 26S , it will OEM will unlock , but you don't update to official 26S, only flash the firmware at the link https://www.needrom.com/download/le...728-multilanguage-rom-unbrick-phone-fastboot/
You can do exactly the same with any custom 26S.
Greetings.
P.S. NEVER flash official 26S firmware, contains routine blocking. Only 26S firmware modified that does not activate blocking. The lock is on the official firmware and boot.img, not on the rom.