You have a corrupted boot image. Flashing the full UPDATE.APP via SD card should fix this.
Get the specific firmware for your CUN-L21 model. Huawei usually provides firmware packages that include a guide. huawei cun-l21 flash file sd card
: Back up all important data as this process typically wipes the device. Preparation of SD Card Download Firmware : Obtain the official firmware for the Create Folder You have a corrupted boot image
| Feature | SD Card Method | PC Method | |---------|----------------|------------| | Computer required | ❌ No | ✅ Yes | | USB drivers needed | ❌ No | ✅ Yes | | Risk of bricking | Low | Medium (if wrong scatter file) | | Success rate | Very high | High | | Skill level | Beginner | Advanced | Huawei usually provides firmware packages that include a
Unlike PC-based tools (like IDT or SP Flash Tool), the SD Card method does not require a computer, drivers, or USB debugging. It is a "forced upgrade" that works even if the phone has a corrupted bootloader or recovery mode.
Before starting the update process, ensure you meet the following requirements to prevent permanent damage to your device: Huawei Y5II - Full phone specifications - GSMArena.com