Install Android 15 on Sony Xperia 1 II (DerpFest OS) – How to Guide!

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Want to install Android 15 on your Sony Xperia 1 II? You are in the right place. This comprehensive, step-by-step guide walks you through the complete process of flashing the unofficial LineageOS 22 custom ROM on the Sony Xperia 1 II (codename: pdx203).

Even though Sony has ended official software support for the Xperia 1 II (which shipped with Android 10 and received Android 12 as its final update), you can breathe new life into this Snapdragon 865-powered device with Android 15. This custom ROM delivers the latest Android features, improved performance, better battery optimization, enhanced privacy controls, and a clean AOSP stock Android experience.

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Why Install Android 15 on Sony Xperia 1 II?

The Sony Xperia 1 II (released May 2020) was a flagship smartphone powered by the Qualcomm Snapdragon 865 processor with 8GB RAM and a gorgeous 6.5 inch 4K HDR OLED display. Despite being a capable device, Sony ended official software support at Android 12, leaving users stuck on outdated software with potential security vulnerabilities.

Installing Android 15 via DerpFest OS gives your Sony Xperia 1 II a second life with:

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Latest Security Patches
Protection against current known vulnerabilities and exploits.
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Better Performance
AOSP-based ROMs are usually leaner and faster than stock firmware.
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Extended Battery Life
Android 15 power optimizations can improve battery efficiency.
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Modern App Support
Run newer apps that require recent Android API levels.
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Android 15 Key Features You'll Get on Sony Xperia 1 II

Android 15 on Sony Xperia 1 II with DerpFest OS delivers a modern Android experience. Android 15 focuses on stability, privacy controls, and performance tuning. These are the key improvements you can expect from this update:

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Private Space

Sensitive apps can stay isolated behind an extra unlock boundary for improved privacy.
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Faster App Launch

Runtime and system optimizations reduce lag and improve app responsiveness.
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Background Efficiency

Smarter process handling lowers unnecessary battery drain in idle and standby states.
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Media and Audio Upgrades

Improved media pipeline behavior and cleaner handling for playback and recording tasks.
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Security Hardening

Stronger platform-level protections and safer defaults for modern apps.
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Refined System UI

Polished UX details across notifications, quick settings, and platform interactions.
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Important Warnings — Read Before Installing Android 15

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Device-specific ROM: This Android 15 custom ROM is ONLY for the Sony Xperia 1 II. Do not flash it on any other device — it will brick your device.

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Brick risk: Carefully follow every step in the correct order. Incorrect installation — such as flashing the wrong file, interrupting the process, or skipping the wipe — can permanently brick your Sony Xperia 1 II. TheUpgradeGuide is not responsible for any damage.

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Complete data wipe: Installing this custom ROM erases everything on your Sony Xperia 1 II — apps, photos, contacts, messages, and files. Create a complete backup before proceeding.

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Battery requirement: Charge your Sony Xperia 1 II to at least 50–60% before starting. An accidental shutdown during the flashing process can leave your device in a non-bootable state.

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Warranty void: Unlocking the bootloader and installing a custom ROM will void your manufacturer warranty.

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Pre-Installation Requirements for Sony Xperia 1 II

Make sure you have all of the following ready before starting the Android 15 installation on your Sony Xperia 1 II:

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Unlocked bootloader: Your Sony Xperia 1 II must have an unlocked bootloader. Use Xiaomi’s official Mi Unlock Tool if you haven’t done this. The process requires linking your Mi account and waiting approximately 7 days.

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TWRP Recovery installed: You must have TWRP Recovery installed on your Sony Xperia 1 II. Watch TWRP installation tutorial for Sony Xperia 1 II →

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Full data backup: Back up all important data — photos, contacts, messages, app data, WhatsApp chats, and files — before starting the installation. Consider using Google Backup and Google Photos for cloud backup.

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USB drivers installed: Install the appropriate USB drivers on your PC/Mac. These are needed if you’re using ADB/Fastboot for any part of the process.

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XDA Forum Thread: DerpFest OS for Sony Xperia 1 II — XDA Forum →

Always check this XDA Forum thread for the latest build updates, known bugs, required patches, firmware requirements, and community feedback before installing.

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Download Android 15 ROM & GApps for Sony Xperia 1 II

DerpFest OS ROM (AOSP-Based Android 15) for Sony Xperia 1 II

Google Apps (GApps) for Android 15 ARM64 – Choose One Package

apps LiteGApps (Android 15 ARM64)apps NikGApps (Android 15 ARM64)apps MindTheGApps (Android 15 ARM64)apps BiTGapps (Android 15 ARM64)

search Not sure which GApps to pick? Read our complete GApps compatibility guide ->

bolt Quick Installation Overview

Short on time? Here’s the 5-step summary of how to install Android 15 on your Sony Xperia 1 II. Scroll down for the detailed guide with screenshots.

  1. 1Download the DerpFest OS Android 15 ROM & GApps for Sony Xperia 1 II.
  2. 2Boot your Sony Xperia 1 II into TWRP custom recovery mode.
  3. 3Wipe system, vendor, data, cache, and dalvik cache partitions.
  4. 4Flash the Android 15 ROM zip followed by the GApps zip via TWRP Install.
  5. 5Wipe cache, reboot, and enjoy Android 15 on your Sony Xperia 1 II!
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Step-by-Step: Install Android 15 on Sony Xperia 1 II

1

install_mobile Install TWRP Custom Recovery on Sony Xperia 1 II

The first step is to install TWRP (Team Win Recovery Project) custom recovery on your Sony Xperia 1 II. TWRP replaces the stock recovery and allows you to flash custom ROMs, GApps, and create complete system backups. You’ll need a PC/Mac with ADB and Fastboot tools installed, plus a USB cable. If TWRP is already installed on your Sony Xperia 1 II, skip directly to Step 2.

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file_copy Transfer the ROM and GApps Files to Your Sony Xperia 1 II

Download the Android 15 DerpFest OS ROM zip and your preferred GApps package from the download section above. Connect your Sony Xperia 1 II to your computer via USB and transfer both .zip files to the device’s internal storage root folder or SD Card. Remember the file location — you’ll need to find these files in TWRP later.

Transfer Android 15 DerpFest OS ROM and GApps zip files to Sony Xperia 1 II internal storage via USB
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restart_alt Boot Sony Xperia 1 II into TWRP Recovery Mode

Disconnect the USB cable and power off your Sony Xperia 1 II completely. Once the device is off, press and hold the Power button + Volume Up button simultaneously until you see the TWRP logo appear on screen. Release both buttons when TWRP loads. If prompted, swipe to allow modifications.

Boot Sony Xperia 1 II into TWRP Recovery Mode using Power and Volume Up buttons
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backup Create a Nandroid Backup of Your Current ROM

This step is critical for safety. In TWRP, tap Backup and create a complete Nandroid Backup. This creates a bit-for-bit copy of your entire current system — including the ROM, apps, data, and settings. If anything goes wrong during the Android 15 installation, or if you want to return to your previous ROM, you can restore this backup in minutes.

Detailed Nandroid Backup guide →

Create a full Nandroid Backup in TWRP before installing Android 15 on Sony Xperia 1 II
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delete_sweep Perform a Factory Reset Using Advanced Wipe

Now perform a thorough Factory Reset to prepare your Sony Xperia 1 II for the Android 15 ROM. In TWRP, navigate to Wipe → Advanced Wipe. Check the boxes for Cache, Dalvik Cache, System, and Data partitions. Then Swipe to Wipe. This completely clears the old system files, user data, and cache — preventing conflicts with the new Android 15 ROM.

TWRP Advanced Wipe selecting Cache, Dalvik, System, and Data partitions on Sony Xperia 1 II
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home Return to the TWRP Main Menu

After the wipe completes successfully, navigate back to the TWRP Main Menu by tapping the back arrow or pressing the home/center navigation button on your Sony Xperia 1 II. You should see the main TWRP screen with options like Install, Wipe, Backup, Restore, etc.

Navigate back to TWRP Main Menu on Sony Xperia 1 II after factory reset
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system_update Flash the Android 15 ROM (DerpFest OS)

This is the main step. From the TWRP Main Menu, tap Install. Navigate to the folder where you saved the DerpFest OS (Android 15) ROM zip file. Tap the file to select it, then Swipe to Confirm Flash. The flashing process takes 2–5 minutes — do not touch anything or power off your Sony Xperia 1 II until it completes. You’ll see “Successful” when done.

Flash Android 15 DerpFest OS custom ROM zip file via TWRP Install on Sony Xperia 1 II
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apps Flash the Google Apps (GApps) Package

Immediately after the ROM flash completes, do not reboot yet. Instead, tap “Install” again (or use the back button), navigate to your GApps zip file, and flash it the same way. This installs the Google Play Store, Gmail, Google Maps, YouTube, and other essential Google services on your Sony Xperia 1 II. Without GApps, you won’t have access to Google services or the Play Store.

Flash GApps package via TWRP immediately after Android 15 ROM on Sony Xperia 1 II
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cached Wipe Cache and Dalvik Cache

After the GApps flash completes, you’ll see a “Wipe cache/dalvik” button at the bottom left of the TWRP screen. Tap it and Swipe to Wipe. This clears any residual cached data and ensures a clean, error-free first boot of Android 15 on your Sony Xperia 1 II. Skipping this step can cause boot loops or app crashes.

Wipe cache and dalvik cache in TWRP after flashing Android 15 ROM and GApps on Sony Xperia 1 II
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restart_alt Reboot Your Sony Xperia 1 II into Android 15

After the cache wipe completes, Press the Home Button, Click Reboot button from the main menu, Tap on System and Swipe to Reboot. Your Sony Xperia 1 II will now boot into Android 15 (DerpFest OS) for the first time! Important: The first boot typically takes 5–10 minutes as the system optimizes all applications. The screen may appear stuck on the boot animation — this is completely normal. Do not force restart during this process.

Reboot Sony Xperia 1 II into Android 15 DerpFest OS - first boot after successful custom ROM installation
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Android 15 Successfully Installed on Your Sony Xperia 1 II!

Congratulations! You’ve successfully installed Android 15 (DerpFest OS) on your Sony Xperia 1 II. Enjoy the latest Android features, improved performance, enhanced security, and a clean stock Android experience on your refreshed device!

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What’s Working & Not Working on Android 15 (Sony Xperia 1 II)

Based on the XDA Forum thread and community reports, here’s the current status of features on the DerpFest OS (Android 15) ROM for the Sony Xperia 1 II. Note: This may vary between builds, so always check the latest forum post.

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  • ✅ Phone calls & SMS
  • ✅ Wi-Fi & Hotspot
  • ✅ Mobile data (4G LTE)
  • ✅ Bluetooth & audio
  • ✅ Camera (photo & video)
  • ✅ GPS & location
  • ✅ Fingerprint sensor
  • ✅ NFC

cancel Known Issues

  • ⚠️ Minor camera quirks in some modes
  • ⚠️ Some hardware features may vary by build

Always check the XDA Forum thread for the most up-to-date bug list for your specific build version.

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Troubleshooting Common Issues

🔄 Stuck on Boot Animation (Bootloop)

If your Sony Xperia 1 II is stuck on the boot animation for more than 15 minutes, it may be bootlooping. Reboot into TWRP (Power + Vol Up), perform a full wipe (System, Data, Cache, Dalvik), and re-flash the ROM and GApps. Make sure you’re using compatible GApps for Android 15 arm64.

❌ “Error 7” or “Zip Verification Failed”

This usually means you’re flashing a ROM not built for your device. Double-check that the ROM zip is specifically for the Sony Xperia 1 II. Also ensure your TWRP version is up-to-date and compatible with Android 15 ROMs.

📱 No Mobile Data or Signal After Installation

You may need to flash the correct firmware (baseband/modem) before installing the ROM. Check the XDA Forum thread for the recommended firmware version for your build of DerpFest OS.

🔙 How to Restore Back to Stock ROM

If you want to go back to the stock ROM: (1) restore your Nandroid Backup via TWRP → Restore, or (2) download the official stock ROM from the manufacturer and flash it using the appropriate flash tool on your PC. This will completely restore your Sony Xperia 1 II to factory stock condition.

Frequently Asked Questions — Android 15 on Sony Xperia 1 II

Here are answers to the most commonly asked questions about installing and using Android 15 (DerpFest OS) on the Sony Xperia 1 II:

Is the Android 15 ROM for Sony Xperia 1 II stable enough for daily use?

The DerpFest OS (Android 15) ROM for the Sony Xperia 1 II is an unofficial build. Core features — including phone calls, Wi-Fi, mobile data, camera, Bluetooth, GPS, and the fingerprint scanner — work well in most builds. Some minor bugs may exist depending on the build version. We recommend checking the XDA Forum thread for the latest known issues before installing it as your daily driver.

Will installing a custom ROM void my Sony Xperia 1 II warranty?

Yes, unlocking the bootloader and installing a custom ROM voids the manufacturer warranty. However, since the Sony Xperia 1 II was released in September 2019, virtually all units are well past their warranty period, so this shouldn’t be a concern for most users.

Can I go back to stock ROM after installing Android 15 on my Sony Xperia 1 II?

Absolutely. You have two options: (1) Restore your Nandroid Backup through TWRP Recovery to return to your exact previous ROM state, or (2) Download the official stock ROM from the manufacturer’s website and flash it using the appropriate flash tool to perform a clean restore to stock firmware.

Which GApps package should I use with Android 15 on Sony Xperia 1 II?

You can choose from four popular options: LiteGApps (recommended for minimal footprint), NikGApps (offers granular control over which Google apps to install), MindTheGApps (balanced package), or BiTGapps (lightweight alternative). All must be the ARM64 variant for Android 15 (API 35). Read our complete GApps compatibility guide to choose the best option for your needs.

Do I need an unlocked bootloader to install Android 15 on Sony Xperia 1 II?

Yes, an unlocked bootloader is a mandatory prerequisite. Without it, you cannot install TWRP Recovery or flash any custom ROM. Use the manufacturer’s official unlock tool to request a bootloader unlock. The process typically involves a waiting period before the unlock is approved.

Does the Android 15 ROM support the Sony Xperia 1 II’s fingerprint scanner?

Yes, in most DerpFest OS builds for the Sony Xperia 1 II, the fingerprint scanner works correctly. However, functionality can occasionally vary between different build versions. If the fingerprint scanner isn’t working after installation, try updating to the latest build or check the XDA Forum for any required patches.

How do I update the Android 15 ROM on my Sony Xperia 1 II after installation?

To update to a newer build of DerpFest OS: Download the latest ROM zip from the LineageOS download page, transfer it to your device, reboot into TWRP, and flash the new ROM zip over the existing installation (this is called a “dirty flash”). Then wipe cache/dalvik and reboot. A full data wipe is usually not needed for minor updates, but always check the XDA thread for update-specific instructions.

Is the Xiaomi Mi CC9 the same as the Sony Xperia 1 II for custom ROM installation?

Yes, the Xiaomi Mi CC9 and Sony Xperia 1 II are the same hardware device sold under different names in different regions. The Mi CC9 was the Chinese variant, while the Sony Xperia 1 II was the global/international variant. Both use the exact same ROM, TWRP recovery, firmware, and kernel files. You can follow this same guide for either device.

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Have questions or ran into issues while installing Android 15 on your Sony Xperia 1 II? Drop a comment below and we’ll help you out! You can also get support from the XDA Forum community where the ROM developer and experienced users actively respond to questions.