Can you try these and report back
$this->bbcode_second_pass_code('', 'pacman -U http://myplugbox.com/.trimslice/linux-trimslice/linux-headers-trimslice-3.1.10-3-armv7h.pkg.tar.xz http://myplugbox.com/.trimslice/linux-trimslice/linux-trimslice-3.1.10-3-armv7h.pkg.tar.xz http://myplugbox.com/.trimslice/nvidia-trimslice/nvidia-trimslice-15.1.0-1-armv7h.pkg.tar.xz')