why won't my ulefone note 18 ultra go into boot mode

I'm trying to hard reset my ulefone note 18 ultra and for the life of me I can't seem to get it to the boot mode screen... I've watched many videos and read many tutorials on sites but none seem to work and it's driving me crazy 🤣 I can't get past the password as I bought the phone from some random guy whom I can't get ahold of. Anyone have a solution or have run into thos issue themselves , oh and I don't have a PC to connect it to at the moment either lol