Welcome to the Dell Community  @cspguy 

Disconnect the AC adapter.

Remove Main battery.

Remove Base Cover.

Disconnect BIOS/RTC battery.

Connect AC adapter and power-on for a few seconds.

Disconnect AC adapter and connect BIOS/RTC battery.

Reassemble and try installing update again.

Best regards,

U2

Welcome to the Dell Community @JM204984 

If you had trouble I'll try it on 3-4 E6430's in the morning.

I'll first update to A23 then update to A24 and post my results.

Best regards,

U2

NOTE:

Have you been able to update to A24???

I tried this going from A23 to latest A24 and this did not work. It does resolve some issues sometimes, just not this time.