diff --git a/build.sh b/build.sh
index 42ad083..916d42b 100755
--- a/build.sh
+++ b/build.sh
@@ -5,7 +5,10 @@ ROOT_PATH=$(pwd)
 WORKING_PATH=/root/work
 CHROOT_PATH="${WORKING_PATH}/chroot"
 IMAGE_PATH="${WORKING_PATH}/image"
-KERNEL_VERSION=5.16.0
+KERNEL_VERSION=5.15.14
+PKGREL=2
+sed -i "s/KVER/${KERNEL_VERSION}/g" $(pwd)/files/chroot_build.sh
+sed -i "s/PREL/${PKGREL}/g" $(pwd)/files/chroot_build.sh
 
 if [ -d "$WORKING_PATH" ]; then
   rm -rf "$WORKING_PATH"
diff --git a/files/chroot_build.sh b/files/chroot_build.sh
index f105a3e..2eb17cd 100755
--- a/files/chroot_build.sh
+++ b/files/chroot_build.sh
@@ -68,8 +68,8 @@ apt-get install -y -qq -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="
 
 # This is not ideal, but it should work until the apt repo gets updated.
 
-curl -L https://github.com/AdityaGarg8/T2-Ubuntu-Kernel/releases/download/v5.16-2/linux-headers-5.16.0-t2_5.16.0-2_amd64.deb > /tmp/headers.deb
-curl -L https://github.com/AdityaGarg8/T2-Ubuntu-Kernel/releases/download/v5.16-2/linux-image-5.16.0-t2_5.16.0-2_amd64.deb > /tmp/image.deb
+curl -L https://github.com/AdityaGarg8/T2-Ubuntu-Kernel/releases/download/vKVER-PREL/linux-headers-KVER-t2_KVER-2_amd64.deb > /tmp/headers.deb
+curl -L https://github.com/AdityaGarg8/T2-Ubuntu-Kernel/releases/download/vKVER-PREL/linux-image-KVER-t2_PREL-2_amd64.deb > /tmp/image.deb
 curl -L https://cdn.discordapp.com/attachments/706581810745966653/926729551558639646/iso-firmware.deb > /tmp/firmware.deb
 file /tmp/*
 apt install /tmp/headers.deb /tmp/image.deb /tmp/firmware.deb
diff --git a/files/grub/grub.cfg b/files/grub/grub.cfg
index 5f4879b..d19c83e 100644
--- a/files/grub/grub.cfg
+++ b/files/grub/grub.cfg
@@ -7,35 +7,35 @@ set default="0"
 set timeout=30
 
 menuentry "Try Ubuntu FS without installing" {
-   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro pcie_ports=compat acpi=force ---
+   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash ---
    initrd /casper/initrd
 }
 menuentry "Try Ubuntu FS without installing (efi=noruntime)" {
-   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro efi=noruntime pcie_ports=compat acpi=force ---
+   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro efi=noruntime pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash ---
    initrd /casper/initrd
 }
 menuentry "Try Ubuntu FS without installing (blacklist=thunderbolt)" {
-   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro pcie_ports=compat acpi=force --- modprobe.blacklist=thunderbolt
+   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash --- modprobe.blacklist=thunderbolt
    initrd /casper/initrd
 }
 menuentry "Try Ubuntu FS without installing (blacklist=thunderbolt and efi=noruntime)" {
-   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro efi=noruntime pcie_ports=compat acpi=force --- modprobe.blacklist=thunderbolt
+   linux /casper/vmlinuz file=/cdrom/preseed/mbp.seed boot=casper ro efi=noruntime pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash --- modprobe.blacklist=thunderbolt
    initrd /casper/initrd
 }
 menuentry "Install Ubuntu FS" {
-   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity pcie_ports=compat acpi=force ---
+   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash ---
    initrd /casper/initrd
 }
 menuentry "Install Ubuntu FS (efi=noruntime)" {
-   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity efi=noruntime pcie_ports=compat acpi=force ---
+   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity efi=noruntime pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash ---
    initrd /casper/initrd
 }
 menuentry "Install Ubuntu FS (blacklist=thunderbolt)" {
-   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity pcie_ports=compat acpi=force --- modprobe.blacklist=thunderbolt
+   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash --- modprobe.blacklist=thunderbolt
    initrd /casper/initrd
 }
 menuentry "Install Ubuntu FS (blacklist=thunderbolt and efi=noruntime)" {
-   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity efi=noruntime pcie_ports=compat acpi=force --- modprobe.blacklist=thunderbolt
+   linux /casper/vmlinuz preseed/file=/cdrom/preseed/mbp.seed boot=casper only-ubiquity efi=noruntime pcie_ports=compat acpi=force intel_iommu=on iommu=pt quiet splash --- modprobe.blacklist=thunderbolt
    initrd /casper/initrd
 }
 menuentry "Check disc for defects" {