Download Oppo A1k CPH1923 Firmware (A.16

Oppo A1k (CPH1923) is a budget Helio P22 handset that commonly develops issues like bootloops, logo hang, FRP lock and severe lag after long-term use or failed modifications. The firmware packages below are full stock ROMs designed to restore ColorOS, fix broken system partitions and unbrick units that no longer respond to normal factory reset or simple recovery options.

All listed builds belong to the official CPH1923 / CPH1923EX line, keeping the device on Android 9 while providing different security patch levels and stability tweaks.

Download Firmware for Oppo A1k (CPH1923)

This section lists all available Oppo A1k CPH1923 firmware packages from the newest maintenance releases to the earliest launch builds, so you can pick a ROM that matches your repair scenario instead of flashing blindly. In general, use A.38 as the primary recovery target, keep A.27 and A.25 as fallbacks for older boards, and reserve A.23, A.21 and A.16 for controlled downgrades, data work or stubborn compatibility cases.

Filename	Region / Variant	Build / Version	Release Date	Android / ColorOS	Patch Level	Flashing Method	Size	Best Use Case & Notes	Download
CPH1923EX_11_A.38_201221_713dac90.zip	EX (Global export)	A.38 (CPH1923EX_11_A.38)	2020-12-21	Android 9, ColorOS 6	Late 2020 security	Scatter / SP Flash Tool, Realme/Oppo service tools	5.24 GB	This is the recommended main repair firmware for most Oppo A1k units, with newer modem tuning, bug fixes and a mature ColorOS build; ideal for fixing hang-on-logo, bootloops and system damage on devices that already ran late A-series updates.	Download A.38 ZIP
CPH1923EX_11_A.38_201221_713dac90.7z	EX (Global export)	A.38 (compressed variant)	2020-12-21	Android 9, ColorOS 6	Late 2020 security	Scatter / SP Flash Tool, Realme/Oppo service tools	4.50 GB	Contains the same A.38 content as the ZIP package but compressed in 7z format to reduce download size; useful where bandwidth is limited, but it must be extracted with 7-Zip or similar before loading the scatter file.	Download A.38 7z
CPH1923EX_11_A.27_200220_fa68774e.zip	EX (Global export)	A.27 (CPH1923EX_11_A.27)	2020-02-20	Android 9, ColorOS 6	Early 2020 security	Scatter / SP Flash Tool, Realme/Oppo service tools	5.7 GB	Suitable for units that originally shipped on mid-2019 to early-2020 firmware or for users who find A.38 slightly heavier; a solid choice when you want a stable ROM that feels closer to the phone’s factory state but still newer than first-wave builds.	Download A.27 ZIP
CPH1923EX_11_A.25_191119_7cc0f580.zip	EX (Global export)	A.25 (CPH1923EX_11_A.25)	2019-11-19	Android 9, ColorOS 6	Late 2019 security	Scatter / SP Flash Tool, Realme/Oppo service tools	5.26 GB	A good option when repairing very old A1k boards or devices that do not boot cleanly on newer updates; also handy when you want slightly older connectivity behavior or need to match a customer’s previous software for investigation.	Download A.25 ZIP
CPH1923_11_A.23_191017_6db7754b.zip	Standard CPH1923 (multi-region)	A.23 (CPH1923_11_A.23)	2019-10-17	Android 9, ColorOS 6	Late 2019 security	Scatter / SP Flash Tool, Realme/Oppo service tools	5.51 GB	Useful when matching early retail software or reproducing the user’s original environment for troubleshooting; consider it a targeted downgrade ROM rather than your first choice for generic repairs.	Download A.23 ZIP
Oppo_A1K_CPH1923_11_A.21_190814.zip	CPH1923 early global	A.21 (CPH1923_11_A.21)	2019-08-14	Android 9, ColorOS 6	Mid 2019 security	Scatter / SP Flash Tool, Realme/Oppo service tools	5.4 GB	An older maintenance build primarily for devices that refuse newer firmware or for cases where a technician wants to revert as close as possible to mid-2019 software for compatibility checks; avoid using it as a routine “latest update”.	Download A.21 ZIP
Oppo_A1K_CPH1923_11_A.16_190430.zip	Launch / first-wave firmware	A.16 (CPH1923_11_A.16)	2019-04-30	Android 9, ColorOS 6	Early 2019 security	Scatter / SP Flash Tool, Realme/Oppo service tools	5.4 GB	Very early ROM close to launch software, mainly for strict downgrade, forensic or lab scenarios and for rare cases where newer builds do not boot at all; not recommended as a daily-use system because it lacks later stability and security fixes.	Download A.16 ZIP

Complete Device & Firmware Overview

Device Name: Oppo A1k
Model Number: CPH1923 / CPH1923EX only; other Oppo models, even if similar in design, must not use these files.
Chipset / SoC: MediaTek MT6762 Helio P22 with octa-core Cortex-A53 CPU and PowerVR GE8320 GPU, tuned for basic apps and light gaming rather than heavy titles.
Memory & Storage: 2 GB or 3 GB RAM with 32 GB internal eMMC; the low RAM means poorly optimized firmware or leftover modifications can quickly lead to stutter and freezes.
Display: 6.1-inch HD+ IPS LCD (720 x 1560) targeting entry-level users who prioritize endurance and reliability over high refresh rates.
Battery: 4000 mAh non-removable battery with microUSB 2.0 charging, no fast charge; firmware can influence background drain but cannot change physical battery capacity.
Original Software: Shipped with Android 9 Pie and ColorOS 6, with incremental A.16–A.38 updates adding optimizations and security patches while staying on the same Android generation.
Firmware Line: CPH1923 / CPH1923EX_11_A.xx series: A.16 → A.21 → A.23 → A.25 → A.27 → A.38, all built as signed stock ROMs for this exact hardware platform.
Firmware Type: Full stock firmware / service ROMs in ZIP or 7z format, usually containing scatter files, partition images and required components for MTK flashing.
Security Patch Range: From early 2019 on A.16 up to late 2020 on A.38, giving technicians a wide window for choosing between compatibility and patch level.
Flash Method: Primarily SP Flash Tool or Realme/Oppo tools that support MTK scatter projects and OFP/converted firmware for CPH1923.
Bootloader & Auth: Some operations may require authorized accounts or matching DA/auth files; community “no-auth” scatters exist but still carry risk if misused.
Bootloader Rules: These stock ROMs do not bypass Oppo’s bootloader policies; they restore official software and are not intended as unlock tools for custom ROM deployment.
File Size: Each full firmware package is approximately 5–5.7 GB; the A.38 7z build is smaller to download but expands after extraction.
Required Tools: Windows PC, SP Flash Tool (recent build), appropriate MTK USB drivers, and if needed, correct DA/auth files for secure-booted units.
Typical Use Cases: Fixing software brick, bootloops, FRP issues, corrupted system partitions, or cleaning after failed rooting and modification attempts on Oppo A1k.

CRUCIAL WARNING: These firmware packages are strictly for Oppo A1k with model CPH1923 / CPH1923EX. They must not be flashed to other Oppo or Realme phones, or to different MTK models with similar design, because cross‑flashing can permanently damage the board or disable network functions.

Most CPH1923 scatter projects include preloader, modem and NVRAM-related partitions; using aggressive options like “format all” with a wrong ROM can cause dead boot, lost IMEI or calibration problems. Always confirm the exact model code from the sticker and in preloader mode before flashing, and only write the partitions you truly need for the job.

Preparation Before Flashing

Tap to view all recommended preparations for Oppo A1k CPH1923

Confirm that the phone is really CPH1923/CPH1923EX by checking the back label, SIM tray and existing software info; if the model string differs, stop and use the correct firmware for that unit.
Charge the A1k to at least 60% if it can still power on, and use a stable USB port and cable to reduce chances of disconnection while SP Flash Tool is writing system or preloader.
Install MTK VCOM or CDC drivers on your Windows PC so that the device is detected properly in preloader/BROM mode when you connect it powered off.
Choose your target build carefully: start with A.38 for general repair, keep A.27 or A.25 as alternatives if there are post-flash issues, and only go down to A.23, A.21 or A.16 for specific downgrade or compatibility reasons.
Back up user data whenever possible, and for workshop-level work, make NVRAM/IMEI backups before any “format” operations, because losing modem data on MT6762 devices requires extra steps to repair.

Quick Firmware Flash Instructions

The steps below summarise a safe, high-level approach to flashing Oppo A1k CPH1923 firmware using MTK scatter tools; adjust details according to your exact SP Flash Tool or service environment.

On your PC, download and extract the required firmware (preferably CPH1923EX_11_A.38_201221_713dac90 ZIP or its 7z variant) into a simple directory path, then launch SP Flash Tool and load the MT6762 scatter file from the extracted folder.
In SP Flash Tool, verify that the selected partitions match your repair goal, leaving preloader unticked unless you are dealing with a confirmed hard-brick on a genuine CPH1923 board and you have no other option.
Click the “Download” or “Firmware Upgrade” button, power the device off completely, and connect the A1k via USB so it can be detected in preloader/BROM mode and the flashing process can start automatically.
Allow the tool to finish writing all selected partitions without interruption; once the success message appears, disconnect the cable and boot the phone, expecting a longer first startup as ColorOS rebuilds caches.
If you experience network, camera or performance issues after flashing A.38, repeat the process with an alternative build like A.27 or A.25 rather than reflashing the same file multiple times, and re-check NVRAM/IMEI status if connectivity is abnormal.

For a full, step-by-step walkthrough of flashing MTK phones with scatter firmware, including screenshots and DA/auth options, follow this detailed SP Flash Tool guide:
Flash MediaTek firmware using SP Flash Tool (recommended reference for Oppo A1k CPH1923).

Frequently Asked Questions (FAQs)

Which Oppo A1k firmware build should I use first?

In most repair cases, A.38 (CPH1923EX_11_A.38_201221) is a practical first choice because it combines late 2020 security with a mature, stable ColorOS build for CPH1923. Only move down to A.27 or A.25 if the phone shows boot issues or unexpected behaviour on A.38, and keep A.23/A.21/A.16 strictly for downgrade or special testing scenarios.

Will flashing stock ROM improve gaming performance on Oppo A1k?

Flashing clean stock firmware can remove software glitches, malware and heavy modifications that cause extra lag, which often translates into smoother basic performance. However, the Helio P22 chip and 2–3 GB RAM still limit heavy gaming, so you should also manage background apps, storage space and device temperature for best results.

Can these CPH1923 files be used to unlock the bootloader?

No, these ROMs are official service firmware designed to restore stock software and they do not change Oppo’s bootloader policies or provide unlock codes. For most workshops, the realistic use of these builds is repair and unbrick, not enabling custom recovery or third-party ROMs.

Can I remove FRP or screen lock on A1k by flashing these ROMs?

A full firmware flash with certain options may remove user data, which can also clear some locks, but behaviour depends on security patch level and flashing mode. Treat these files primarily as repair ROMs and only use them for lock-related work in line with local laws, customer consent and your own risk assessment.

Why are there both “CPH1923EX” and plain “CPH1923” builds listed?

“EX” generally marks export/global variants while “CPH1923” alone can refer to broader or region-specific releases, so behaviour such as modem configuration or preloaded apps may differ slightly. When unsure, A.38 EX is usually a safe starting point for global units, and the plain CPH1923 builds like A.23 and A.21 are best kept for matching older or previously observed software.

Does moving from A.16 or A.21 to A.38 change battery life?

Newer firmware can refine background process management and connectivity behaviour, which sometimes improves standby time but might also reveal weak batteries on older phones. After upgrading, let the system settle for a few charge cycles, review installed apps and only consider downgrading if abnormal drain persists with otherwise clean software.