@kev1
I’ve checked your bios file. Yep, your bios lock variable is 0x1c(0x683), but I’ve found one new additional string(Default: DefaultId: 0x0, Value (8 bit): 0x1 {5B 06 00 00 00 01}) below bios lock string. I didn’t see before that string in another original or modified bios files. 
So, ok. Don’t worry about bios lock, as wrote @NeXt3R you have two ways for bios unlocking before flashing: u can try GRUB or RU manually.
But now you need to modify your bios(save the clear copy of your bios in safety place).
I can help you, but first read this:
https://winraid.level1techs.com/t/overpowered-tongfang-cyberpower-machrevo-machenike-unlocked-bios-guide-w-files/33133
then you will choose which kind of bios menu you want. I know two variants with unlocked hidden menus:
https://www.swisstransfer.com/d/1573fc34-ea2b-4371-bcc8-69210e31b254
So, where did you buy your laptop? What is your preinstalled OS\bios version? It is can be important… e.g. bios ver. fe02 can’t be re-flash again… etc.