I have another suggestion you might try with an Asrock motherboard.
Enter BIOS and proceed with the following:
1. Change "CPU Ratio" settings to "Per Core".
2. Disable "Internal PLL Overvoltage".
3. Set "Shared Memory" to 32MB.
4. Set your installation USB's "Hot Plug Enabled" settings to...
For some strange reason, during my own installation of El Capitan 10.11.0 I had to plug in my USB HDD into USB 3.0 since 2.0 would result in an "Failure Creating Boot cache" error during El Capitan installation. The "Insert correct boot(...)" error you're having is common when you don't have...
:idea: Edit: I finally managed to get the card working on El Captan 10.11.0 using the following kexts:
Google "TL-WN751ND Kext Yosemite Edition 2.0" and the first link will direct you to the download website.
I had to reapply the three kexts after 10.11.3 combo upgrade. I used Kext Wizard...
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