Search: "lineage-17.1-20210103-UNOFFICIAL-i9300.zip" Common XDA thread: "ROM [10.0][UNOFFICIAL] LineageOS 17.1 for Samsung Galaxy S3 (i9300)"
You need a modern version of TWRP that supports Android 10 block structures. Download Link: TWRP for Samsung Galaxy S3 (i9300) Step 2: Root and Install TWRP Recovery
Older versions of TWRP cannot properly unpack and flash Android 10 zip files.
Upgrading to Android 10 introduces a modern user interface, enhanced security permissions, system-wide dark mode, and improved app compatibility. This comprehensive guide details the prerequisites, download locations, and installation steps required to successfully flash an Android 10 custom ROM onto your Samsung Galaxy S3. Disclaimer and Risks
This process requires unlocking the bootloader, installing a custom recovery (TWRP), and flashing a custom ROM. It may void your warranty (if it somehow still exists) and potentially brick your device. Backup everything: Flashing will wipe all your data. samsung s3 custom rom android 10 link
Here are some fictional but working links for illustration:
Several talented developers have created custom Android 10 ROMs for the S3. Each offers a slightly different user experience. Here are the most prominent ones:
LineageOS 17.1 for GT-I9300" . The first post of this thread contains direct links to the Android File Host (AFH) or Mega storage directories maintained by the active developers.
Always read the last few pages of the XDA thread before downloading to check for any newly reported bugs regarding camera stability, RIL (cellular network calls), or Wi-Fi connectivity. Search: "lineage-17
When posting links to Custom ROMs, the "proper" way to do it depends heavily on where you are posting (a forum like XDA, a blog, or social media).
Swipe to confirm the flash. This process may take 3 to 5 minutes. Step 5: Flash Google Apps (GApps)
If you would like to proceed with modifying your device, please tell me:
Disconnect the phone from the PC. Remove the battery for 5 seconds, then reinsert it. Backup everything: Flashing will wipe all your data
Go to the official TWRP website or the dedicated XDA thread for the GT-I9300 TWRP recovery. Ensure you are downloading TWRP version 3.3.x or higher in .img format (for flashing inside recovery) or .tar format (for flashing via Odin). Step-by-Step Installation Guide
Instead, you must use a dedicated custom ROM built specifically for the S3 kernel. The most prominent Android 10 projects for this device were part of the unofficial builds.
Click . Once finished, you will see a green "PASS!" message.
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Connect your phone to your PC. Your phone should appear as a media device. Copy the downloaded and OpenGApps ZIP directly to your phone's internal storage or external SD card. Step 4: Flashing the Android 10 ROM and GApps Return to the TWRP home screen and tap Install . Navigate to the location where you transferred the files. Tap on the LineageOS 17.1 / Android 10 ROM ZIP file.