You might think custom ROMs drain battery faster. Wrong. The Y7 Prime has a massive battery, but EMUI’s background services (Huawei ID, HiCare, Optimizer) constantly wake the CPU. A debloated custom ROM like Pixel Experience (Go edition or standard) can push Screen on Time (SOT) from 5 hours to 7 hours.
If you decide to proceed, follow this optimized guide to maximize success.
Huawei’s post-ban situation doesn't affect the Y7 Prime directly, but GMS (Google Mobile Services) on old EMUI versions is clunky. Many new apps require Android 9 (API 28) or higher. On stock Android 8.1, you are locked out of banking apps and modern games.
Huawei’s proprietary IMS (IP Multimedia Subsystem) implementation is closed-source. On most custom ROMs for Y7 Prime 2018, VoLTE will not work. This means:
Back in 2019, Mark owned a Huawei Y7 Prime 2018. When he first bought it, he loved the sleek metal body and the battery life. But as the years passed, the phone began to show its age. EMUI 8.0 (Android 8.0) started to feel sluggish, apps crashed, and the 32GB storage was constantly full.
Mark felt like he was using a "zombie" phone—technically alive, but very slow and brain-dead. huawei y7 prime 2018 custom rom better
The Discovery One night, frustrated by a lagging game, Mark went online and found the XDA Developers forum. He discovered that his model (codenamed FLA-LX2 or similar) had a vibrant community. He read about an ArrowOS or LineageOS custom ROM based on Android 10 or 11.
The screenshots looked beautiful. The users claimed the phone felt "faster than new," with better battery life and a "stock Android" feel without the Huawei bloatware.
The Trap (The Bootloader) This is where the story becomes helpful for you.
Mark, excited, downloaded the ROM and the TWRP recovery image. He tried to unlock his bootloader using the standard fastboot oem unlock command. It didn't work.
Here is the lesson: Huawei stopped providing official bootloader unlock codes years ago. You might think custom ROMs drain battery faster
The "Brick" Scare Mark successfully unlocked the bootloader. He plugged his phone into his Windows PC and ran the command to flash TWRP (the custom recovery).
He rebooted the phone, but it didn't go into TWRP. It just showed the Huawei logo and turned off. He tried again. Nothing. He had "soft-bricked" his device.
The Fix (The Helpful Tip) Panicking, Mark went back to the guide. He realized his mistake: Flashing methods vary by model number.
He found a specific guide for his exact model number. He rebooted into "Fastboot & Rescue Mode" (hold Volume Down + Power). He re-flashed the recovery correctly this time, holding the correct buttons (Volume Up + Power) immediately after the flash to force the phone into the custom recovery before the stock software could overwrite it.
The Transformation Finally, Mark was inside TWRP. He wiped the Data, Cache, and System partitions (a crucial step he almost forgot). He transferred the ArrowOS ZIP file and the GApps (Google Apps) package to the phone. The "Brick" Scare Mark successfully unlocked the bootloader
He clicked "Install", selected the files, and swiped the slider.
Five minutes later, he rebooted.
The Result The phone took a long time to boot—the "first boot" anxiety was real. But then, the ArrowOS logo appeared. The setup screen loaded. It was Android 10!
Mark had effectively turned his "zombie" phone into a usable daily driver for another two years.