Send your bios chip to me with a return package postage paid and I will flash it for you in a bh6 computer I have 😀
If you want to try hot flashing the chip you need a working computer with the same type of bios chip/socket and a program called uniflash, you boot the computer to a floppy with uniflash and the bios on it then pull the good chip and insert the bad chip and run the flash program.
Check with a local computer shop (not bestbuy/compusa) and find one that has an eprom programer, bring them the chip and a floppy with the bios on it and they will fix you up.