Download High Sierra from the the App Store and place a formatted USB drive named ‘Untitled’ and fire this command into the terminal. Enter your system password and let it run for several minutes.

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia —volume /Volumes/Untitled —applicationpath /Applications/Install\ macOS\ High\ Sierra.app

Tip: Press Ctrl+T to check progression.

Thanks to: Macworld

The DD-WRT router database isn’t accurate. The highest stable DD-WRT firmware build available for the WRT54GL v1.1 is build 14929.

Get the dd-wrt.v24_std_generic.bin from:
ftp://ftp.dd-wrt.com/betas/2010/08-12-10-r14929/broadcom/

Source: Peacock Post.