TWRP device tree for Realme C21Y (RMX3261)

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The Realme C21Y (codenamed "RMX3261'RMX3262'RMX3263") is a mid-range smartphone from Realme.

It was released in 2021, July 02.

Device specifications

Basic	Spec Sheet
CPU	Octa-core (2x1.8 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55)
Chipset	Unisoc T610 (12 nm)
GPU	Mali-G52 MP2
Memory	3GB,4GB RAM
Shipped Android Version	11 GO
Storage	32GB,64GB eMMC 5.1
Battery	5000 mAh, non-removable
Display	720 x 1600 pixels, 20:9 ratio (~270 ppi density)

Features

Blocking checks

• Correct screen/recovery size
• Working Touch, screen
• Backup to internal/microSD
• Restore from internal/microSD
• reboot to system
• ADB

Medium checks

• update.zip sideload
• UI colors (red/blue inversions)
• Screen goes off and on
• F2FS/EXT4 Support, exFAT/NTFS where supported
• all important partitions listed in mount/backup lists
• backup/restore to/from external (USB-OTG) storage
• backup/restore to/from adb (https://gerrit.omnirom.org/#/c/15943/)
• decrypt /data
• Correct date

Minor checks

• MTP export
• reboot to bootloader
• reboot to recovery
• poweroff
• battery level
• temperature
• encrypted backups
• input devices via USB (USB-OTG) - keyboard, mouse and disks
• USB mass storage export (device does not support it)
• set brightness
• vibrate
• screenshot
• partition SD card

Compile

First checkout minimal twrp with aosp tree:

repo init --depth=1 -u https://github.com/minimal-manifest-twrp/platform_manifest_twrp_aosp.git -b twrp-11
repo sync -j$(nproc --all)

Then add these projects to .repo/manifest.xml:

<project path="device/realme/RMX3261" name="GitFASTBOOT/android_device_realme_RMX3261" remote="github" revision="android-11" />

Finally execute these:

source build/envsetup.sh
repopick <needed patch>
lunch twrp_RMX3261-eng
mka bootimage -j$(nproc --all)