ColorOS can feel heavy over time. Custom ROMs are typically lightweight, offering a cleaner, snappier user interface, which helps speed up the MediaTek Helio P70 processor.
You will need to root with Magisk and use Zygisk + Shamiko modules to hide the bootloader status. Without this, Google Pay, Barclays, or PayPal will refuse to run.
While the advantages are significant, it is important to consider the drawbacks. As discussed in 2026 developer discussions , custom ROMs are not for everyone.
Released in early 2020, the Oppo A91 was a compelling mid-range device, offering an AMOLED display, sleek design, and capable camera specs for its price point. However, in 2026, many users find the stock experience to be outdated, sluggish, or lacking in customization compared to newer Android iterations. oppo a91 custom rom better
For the Oppo A91, which launched with Android 9.0 Pie and officially received an update to Android 11 via ColorOS 11, the stock software experience is now largely static. Here’s why many users consider making the switch:
You can experience Android 14 or even Android 15 features on your 2019 hardware.
Power users who love tweaks.
Before you get excited, you need to know the bad news. Unlike Xiaomi or OnePlus, OPPO does not provide an official bootloader unlock tool for the A91 (Global/CPH2021).
Custom ROMs (such as Pixel Experience, LineageOS, or Evolution X) are typically stripped down to the essentials. They remove carrier bloatware and unnecessary manufacturer apps. This results in a "lighter" operating system that feels snappier. Animations are often faster, and the MediaTek Helio P70 processor is allowed to manage resources more efficiently without heavy proprietary overlays slowing it down.
| Option | What It Does | Difficulty | |--------|--------------|-------------| | | Remove bloatware without root (disable unwanted OPPO/Google apps) | Easy | | Install GSI (Generic System Image) | Experimental Android 13/14 GSIs might work, but with bugs (camera, fingerprint issues) | Hard | | Use a Third-Party Launcher | Nova Launcher, Lawnchair, or Niagara for a stock Android look/feel | Very Easy | | Disable Animations | Increase perceived speed via Developer Options | Very Easy | | Replace Stock Apps | Use Google Phone/Contacts/Messages instead of OPPO apps | Easy | ColorOS can feel heavy over time
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Best for users who want the look and feel of a Google Pixel device.
The Oppo A91 typically stops receiving major Android version updates after a specific cycle, leaving users stuck on older security patches and interfaces. Without this, Google Pay, Barclays, or PayPal will
Let’s compare the OPPO A91 head-to-head.
Custom ROMs often incorporate privacy-focused features, improved permission management, and the ability to disable components that stock firmware keeps locked down. Many ROMs also support Magisk for systemless root access, allowing granular control over which apps receive elevated privileges.