What part of the readme has you perplexed?
1. Unzip all of the files from the zip package onto USB key, maintaining the directory structure. Please make sure that the USB key is fully compatible with the EFI version on your motherboard. Some incompatible versions may prevent USB key working normally.
2. Boot to the EFI shell
- Press 'F2' during POSt to enter BIOS Setup
- Select Boot Manager -> EFI Shell
Exactly why does it NEED to be updated by the way? Never update stuff unless an exact errata statement fits your exact issue. Never update just to update.