I just wrote down all the steps, try this
To install a zip with Bootstrap
Start Bootstrap
Press reboot recovery
Volume down and highlight “install zip from sdcard”
Press camera button
Volume down and highlight “choose zip from sdcard”
Press camera button
Volume down and highlight zip you want to install
Press camera button
Volume down and highlight “-yes-install-filename.zip
Press camera button
Wait till is says Install from sdcard complete
Press power button for a second
Reboot system now should be highlighted, then press camera button
You done, give it a few min to reboot, some files take longer than others
To install a zip with Bootstrap
Start Bootstrap
Press reboot recovery
Volume down and highlight “install zip from sdcard”
Press camera button
Volume down and highlight “choose zip from sdcard”
Press camera button
Volume down and highlight zip you want to install
Press camera button
Volume down and highlight “-yes-install-filename.zip
Press camera button
Wait till is says Install from sdcard complete
Press power button for a second
Reboot system now should be highlighted, then press camera button
You done, give it a few min to reboot, some files take longer than others