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Deployment Guide

INSTALLATION CENTER.
SAFETY-FIRST FLASHING.

Follow our verified installation procedure. The OnePlus 3T is an A-only partition device. Always backup essential data before executing fastboot commands.

Critical Device Safety Warning

Unlocking the bootloader erases all userdata. Ensure your phone has at least 50% battery before flashing. Never disconnect the USB cable during an active fastboot flash or adb sideload operation.

Path A: Clean Installation

NEW INSTALL

For phones running stock OxygenOS or migrating from another custom ROM.

Step 1: Unlock Bootloader

Enable OEM Unlocking & USB Debugging in Developer Options, then reboot to bootloader:

adb reboot bootloader
fastboot oem unlock

Step 2: Flash CYRONIX Recovery OS

Flash our verified recovery image to the recovery partition:

fastboot flash recovery recovery-cyronix-branded.img
fastboot boot recovery-cyronix-branded.img

Step 3: Factory Reset in Recovery

In CYRONIX Recovery, select Factory Reset > Format data/cache to prepare partitions for FDE encryption.

Step 4: Sideload CYRONIX OS

Select Apply Update > Apply from ADB, then execute:

adb sideload CYRONIX-OS-1.5.1-20260922-user-oneplus3.zip

Step 5: Reboot System

Select Reboot system now. First boot takes approximately 23-30 seconds.

In-Place OS Upgrade

Moving between CYRONIX OS releases (e.g. 1.4.x to 1.5.1 on the same key signing line) preserves all user data.

# In CYRONIX Recovery (Apply from ADB):
adb sideload CYRONIX-OS-1.5.1-20260922-user-oneplus3.zip
# Userdata is preserved; addon.d restores scripts automatically

Bootloop Recovery Procedure

EMERGENCY

If your device fails to complete boot after third-party modifications:

  1. Power off device completely (hold Power for 10 seconds).
  2. Hold Power + Volume Down to boot directly into CYRONIX Recovery OS.
  3. Select Advanced > Enable ADB Sideload.
  4. Re-sideload the verified release zip to restore clean system and boot partitions without touching userdata.