wiki: Update fw installation instructions for oscar

Change-Id: I83764b28c862f3442d85495bbd74d10eff72e8e6

Author: Vivekachooz

_data/devices/oscar_variant1.yml

@@ -1,6 +1,8 @@
 architecture: arm64
 battery: {capacity: 5000, removable: False, tech: 'Li-Po'}
 before_install: {instructions: 'needs_specific_android_fw', ships_fw: True, version: '14'}
+before_install_device_variants:
+  - {device: 'Realme 9 Pro 5G', firmware: '14.0.0.501(EX01)'}
 before_recovery_install: {instructions: 'boot_stack', partitions: [dtbo, boot]}
 bluetooth: {profiles: [A2DP + aptX HD], spec: '5.1'}
 cameras:

_data/devices/oscar_variant2.yml

@@ -1,6 +1,8 @@
 architecture: arm64
 battery: {capacity: 5000, removable: False, tech: 'Li-Po'}
 before_install: {instructions: 'needs_specific_android_fw', ships_fw: True, version: '14'}
+before_install_device_variants:
+  - {device: 'Realme 9 5G', firmware: '14.0.0.501(EX01)'}
 before_recovery_install: {instructions: 'boot_stack', partitions: [dtbo, boot]}
 bluetooth: {profiles: [A2DP + aptX HD], spec: '5.1'}
 cameras:

_data/devices/oscar_variant3.yml

@@ -1,6 +1,8 @@
 architecture: arm64
 battery: {capacity: 5000, removable: False, tech: 'Li-Po'}
 before_install: {instructions: 'needs_specific_android_fw', ships_fw: True, version: '14'}
+before_install_device_variants:
+  - {device: 'Realme Q5', firmware: '14.0.0.501(EX01)'}
 before_recovery_install: {instructions: 'boot_stack', partitions: [dtbo, boot]}
 bluetooth: {profiles: [A2DP + aptX HD], spec: '5.1'}
 cameras:

_includes/templates/device_specific/firmware_update_realme_oscar_fastbootd.md

@@ -0,0 +1,56 @@
+{% include alerts/warning.html content="These instructions are NOT for carrier branded variants." %}
+
+There are three methods to get the required firmware:
+
+### If you are on the stock Realme UI (Android 14 version higher than 14.0.0.501(EX01)) with locked bootloader
+
+Method 1:
+
+1. Download the OTA downgrade package for your device:
+    * Navigate to [Realme's forum](https://c.realme.com).
+    * Go to your device's page by clicking **Product** option, followed by the device's name.
+    * Click **Rollback Package for Name_of_the_device**.
+    * Download and follow **How do I roll back to Android 13** section.
+2. Perform an OTA upgrade through system updater to Android 14 version 14.0.0.501
+    * Navigate to Settings > About device.
+    * Tap on the Realme UI banner.
+    * Tap install button.
+    * Continue the steps untill you install the version 14.0.0.501.
+
+Method 2:
+
+   {% include alerts/warning.html content="Follow this method only if the OTA downgrade package mentioned in Method 1 is not present for your variant" %}
+1. Unlock bootloader
+2. Download the following files from [here](https://download.lineageos.org/devices/oscar/builds)
+    * boot.img
+    * dtbo.img
+    * vendor_boot.img
+3. Power off the device, and boot it into bootloader mode:
+    * {{ device.download_boot }}
+4. Flash the downloaded image files to your device by typing:
+   ```
+   fastboot flash boot boot.img
+   fastboot flash dtbo dtbo.img
+   fastboot flash vendor_boot vendor_boot.img
+   ```
+5. Follow the last method in this page with LineageOS recovery installed section to update to 14.0.0.501 firmware thereafter
+
+### If you are on the stock Realme UI (Android 12/13 version) with locked bootloader
+
+1. Perform an OTA upgrade through system updater to Android 14 version 14.0.0.501
+    * Navigate to Settings > About device.
+    * Click on the Realme UI banner.
+    * Tap install button.
+    * Continue the steps untill you install the version 14.0.0.501.
+
+### If you already installed LineageOS recovery
+
+1. Download the required firmware from [here](https://github.com/Realme-SM6375-devs/firmware/releases)
+2. Extract the firmware zip
+3. Boot up LineageOS recovery
+4. Go to "Advanced" -> "Enter fastboot"
+   {% include alerts/warning.html content="The \"Enter fastboot\" option may not be present on older LineageOS recovery builds and it cannot be substituted with \"Reboot to bootloader\"." %}
+5. Execute following commands:
+   ```
+   {{- include.content -}}
+   ```

_includes/templates/device_specific/firmware_update_realme_sm6375.md

@@ -1,4 +1,4 @@
-{% include templates/device_specific/firmware_update_realme_fastbootd.md content="
+{% include templates/device_specific/firmware_update_realme_oscar_fastbootd.md content="
 fastboot flash --slot=all abl abl.img
 fastboot flash --slot=all bluetooth bluetooth.img
 fastboot flash --slot=all core_nhlos core_nhlos.img