FAQ & Troubleshooting: Added bootloader recovery guide

Author: Shendisx

src/content/docs/cachyos_basic/faq.mdx

@@ -44,6 +44,84 @@ This is why it can take a bit of time to load the installer.
 
 This happens when the installer is struggling to download packages. It's usually a sign of a very slow or unstable internet connection. Please check your network connection and try again.
 
+## Bootloader Recovery
+
+:::note[In case of a deleted /boot partition. Please create a new one following the respective [partition scheme](/installation/installation_on_root#uefigpt) from step 5.]
+:::
+
+### Steps to recover your bootloader
+
+<Steps>
+    1. Boot into the CachyOS Live ISO.
+    2. Open a terminal and chroot into your installed system using the `cachy-chroot` command.
+
+        ```bash
+        sudo cachy-chroot
+        ```
+        If your system is utilizing BTRFS with our preset say `y` in the prompt:
+         ```bash title='Example'
+         Do you want to use CachyOS BTRFS preset to auto mount root subvolume? y
+         Do you want to mount additional partitions? · yes
+         Enter the mount point for additional partition (e.g. /boot) type 'skip' to cancel:
+         # Type /boot for systemd-boot, Limine or rEFInd
+         # Type /boot/efi for GRUB
+         ```
+    3. Follow the instructions below for your installed bootloader and system type (UEFI or MBR/BIOS).
+        <Tabs>
+            <TabItem label='GRUB'>
+                Reinstall GRUB with the following command:
+                <Tabs>
+                    <TabItem label='UEFI'>
+                        ```bash
+                        sudo grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=cachyos
+                        ```
+                    </TabItem>
+                    <TabItem label='MBR/BIOS'>
+                        ```bash
+                        sudo grub-install --target=i386-pc /dev/sdX # Replace sdX with your disk e.g. sda
+                        ```
+                    </TabItem>
+                </Tabs>
+            </TabItem>
+            <TabItem label='systemd-boot (UEFI only)'>
+                Reinstall systemd-boot with the following command:
+                ```bash
+                sudo bootctl install
+                ```
+            </TabItem>
+            <TabItem label='Limine'>
+                Reinstall Limine with the following command:
+                <Tabs>
+                    <TabItem label='UEFI'>
+                        ```bash
+                        sudo limine-install
+                        ```
+                    </TabItem>
+                    <TabItem label='MBR/BIOS'>
+                        ```bash
+                        sudo limine bios-install /dev/sdX # Replace sdX with your disk e.g. sda
+                        ```
+                    </TabItem>
+                </Tabs>
+            </TabItem>
+            <TabItem label='rEFInd (UEFI only)'>
+                Reinstall rEFInd with the following command:
+                ```bash
+                sudo refind-install
+                ```
+            </TabItem>
+        </Tabs>
+    4. Reinstall the CachyOS kernel:
+        ```bash
+        sudo pacman -Sy linux-cachyos linux-cachyos-headers
+        ```
+    5. Exit from cachy-chroot:
+        ```bash
+        exit
+        ```
+    6. Reboot your system.
+</Steps>
+
 ## Package Management & Updates
 
 ### Pacman Troubleshooting