Hi:
Unfortunately, there is nothing we can do to help you, since HP will no longer supply the required SMC.bin file that is used to clear the BIOS password.
That is the only way it could be done.
HP issued this document recently...
https://support.hp.com/us-en/document/c06368824
Also the forum rules were amended on 1 March 2019, which no longer allow us to help with providing unlock codes, etc., to clear BIOS passwords. Rule 4.d...
https://h30434.www3.hp.com/t5/custom/page/page-id/hp.rulespage