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I'm a bit confused by your post on what you are trying to do here. Are you trying to boot into Recovery Mode to install macOS to an external USB drive or are you trying to boot from a macOS USB installer to install macOS to the internal drive?
Here are the instructions for creating a bootable macOS USB installer:
OS X El Capitan PWN: Uploading.TransMac: Uploading. METHOD 1: Using DiskMaker X. Run, DiskMaker X, then.choose El Capitan (10.11). Double click on El Capitan.DMG to mount it, then borrow the El Capitan.app. Select the USB volume name, then select Choose this disk. Click on Erease to format the USB and create the disk. Click Continue, you then are asked for admin and password.
Make sure to carefully read the section regarding macOS 10.11 as there are extra steps required to extract the real installer from the downloaded .dmg archive to the Applications folder. After running the .pkg file from the mounted .dmg file you can then proceed to use the command line to create the bootable macOS USB installer itself.
Macs are very picky about the drives used for booting a Mac plus the quality of many USB sticks is extremely poor so try using another USB stick especially a different brand.
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When erasing the drive make sure to select the whole physical drive within Disk Utility and erase the physical drive as GUID partition and MacOS Extended (Journaled). The physical drive should be the top most item which is usually identified by the make & model of the drive itself.
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El Capitan Bootable Usb Download
Aug 21, 2021 12:52 PM