as an update, I have attempted the BIOS jumper, then unplugged and bios jumper, then unplugged, BIOS battery removed, with jumper switched then after 10 minutes battery back in, boot to bios, set time et al then jumper back .
All with the same issue.
Thanks for coming back to the community.
I understand you had problems with your computer after updating BIOS.
At this stage, I recommend BIOS recovery. This will fix any BIOS corruption.
Instructions for BIOS recovery available below: