redbull: Add flash guides and official information for the P5 series

devices/barbet.json

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+{
+    "maintainer": "Bobby Panarisi (306bobby-android)",
+    "maintainerurl": "https://t.me/the306bobby",
+    "devicemodel": "Pixel 5a",
+    "codename": "barbet",
+    "supportgroupurl": "https://t.me/theredbullroom",
+    "donateurl1": "https://ko-fi.com/306bobby"
+}

devices/bramble.json

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+{
+    "maintainer": "Bobby Panarisi (306bobby-android)",
+    "maintainerurl": "https://t.me/the306bobby",
+    "devicemodel": "Pixel 4a 5G",
+    "codename": "bramble",
+    "supportgroupurl": "https://t.me/theredbullroom",
+    "donateurl1": "https://ko-fi.com/306bobby"
+}

devices/redfin.json

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+{
+    "maintainer": "Bobby Panarisi (306bobby-android)",
+    "maintainerurl": "https://t.me/the306bobby",
+    "devicemodel": "Pixel 5",
+    "codename": "redfin",
+    "supportgroupurl": "https://t.me/theredbullroom",
+    "donateurl1": "https://ko-fi.com/306bobby"
+}

flashguide/barbet.txt

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+### Pre-installation:
+
+* Ensure you are running the latest available stock ROM
+* Optional gapps ([my Nikgapps variants](https://nikgapps.com/306bobby-android) optimized for Pixels or [official NikGapps variants](https://nikgapps.com/downloads))
+* Recovery (from download page, recovery button)
+* Google platform-tools (adb/fastboot)
+
+
+### First time installation (clean flash):
+
+* Step 1: Unlock bootloader and enable adb through developer settings
+* Step 2: On PC enter
+
+```
+adb reboot bootloader
+```
+* Step 3: Now type the following command to unlock the bootloader (if necessary) and flash required images:
+
+```
+fastboot flashing unlock # If required
+fastboot flash boot /path/to/boot.img
+fastboot flash dtbo /path/to/dtbo.img
+fastboot flash vendor_boot /path/to/vendor_boot.img
+```
+* Step 4: Using volume and power buttons, select "Reboot Recovery"
+* Step 5: Wipe data. select Apply Update, then ADB sideload and type
+
+```
+adb sideload /path/to/ROM.zip
+```
+* Step 6: Reboot recovery and sideload any extras, then reboot device!
+
+### Update installation:
+* Step 1: boot phone into normal Android mode
+* Step 2: Download update to phone or adb push from PC
+* Step 3: Open Settings>System>Updater
+* Step 4: Click the hamburger icon on the top right, then Local Update or download the available OTA, and apply
+* Step 5: Stay on this page until reboot prompt OR if the update screen goes blank, reboot / switch slots in root app

flashguide/bramble.txt

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+### Pre-installation:
+
+* Ensure you are running the latest available stock ROM
+* Optional gapps ([my Nikgapps variants](https://nikgapps.com/306bobby-android) optimized for Pixels or [official NikGapps variants](https://nikgapps.com/downloads))
+* Recovery (from download page, recovery button)
+* Google platform-tools (adb/fastboot)
+
+
+### First time installation (clean flash):
+
+* Step 1: Unlock bootloader and enable adb through developer settings
+* Step 2: On PC enter
+
+```
+adb reboot bootloader
+```
+* Step 3: Now type the following command to unlock the bootloader (if necessary) and flash required images:
+
+```
+fastboot flashing unlock # If required
+fastboot flash boot /path/to/boot.img
+fastboot flash dtbo /path/to/dtbo.img
+fastboot flash vendor_boot /path/to/vendor_boot.img
+```
+* Step 4: Using volume and power buttons, select "Reboot Recovery"
+* Step 5: Wipe data. select Apply Update, then ADB sideload and type
+
+```
+adb sideload /path/to/ROM.zip
+```
+* Step 6: Reboot recovery and sideload any extras, then reboot device!
+
+### Update installation:
+* Step 1: boot phone into normal Android mode
+* Step 2: Download update to phone or adb push from PC
+* Step 3: Open Settings>System>Updater
+* Step 4: Click the hamburger icon on the top right, then Local Update or download the available OTA, and apply
+* Step 5: Stay on this page until reboot prompt OR if the update screen goes blank, reboot / switch slots in root app

flashguide/redfin.txt

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+### Pre-installation:
+
+* Ensure you are running the latest available stock ROM
+* Optional gapps ([my Nikgapps variants](https://nikgapps.com/306bobby-android) optimized for Pixels or [official NikGapps variants](https://nikgapps.com/downloads))
+* Recovery (from download page, recovery button)
+* Google platform-tools (adb/fastboot)
+
+
+### First time installation (clean flash):
+
+* Step 1: Unlock bootloader and enable adb through developer settings
+* Step 2: On PC enter
+
+```
+adb reboot bootloader
+```
+* Step 3: Now type the following command to unlock the bootloader (if necessary) and flash required images:
+
+```
+fastboot flashing unlock # If required
+fastboot flash boot /path/to/boot.img
+fastboot flash dtbo /path/to/dtbo.img
+fastboot flash vendor_boot /path/to/vendor_boot.img
+```
+* Step 4: Using volume and power buttons, select "Reboot Recovery"
+* Step 5: Wipe data. select Apply Update, then ADB sideload and type
+
+```
+adb sideload /path/to/ROM.zip
+```
+* Step 6: Reboot recovery and sideload any extras, then reboot device!
+
+### Update installation:
+* Step 1: boot phone into normal Android mode
+* Step 2: Download update to phone or adb push from PC
+* Step 3: Open Settings>System>Updater
+* Step 4: Click the hamburger icon on the top right, then Local Update or download the available OTA, and apply
+* Step 5: Stay on this page until reboot prompt OR if the update screen goes blank, reboot / switch slots in root app