: Users who had "verified" custom ROMs or recoveries (like TWRP) installed but hadn't saved their unique 16-digit unlock code found themselves unable to ever return to stock or update their ROMs if they accidentally relocked the bootloader.

However, the developer community—specifically on forums like

No custom ROM guide is complete without a candid risk assessment:

(formerly SafetyNet). Because Huawei devices use older Kirin processors and lack official bootloader unlock codes, passing these checks on a custom ROM is increasingly difficult and often fails "Strong Integrity". Critical Technical Barriers

(Legacy) Known for high-quality early builds of CyanogenMod and LineageOS for this device. Honor 5C - XDA Forums

typically uses the Kirin 650 chipset, and most verified ROMs are unofficial builds found on community forums: