Author: huawei.com
Model: Huawei Y7 Prime (TRTL21A)
Os : Android
Gapps include: No Rooted
Language support: Multilang
How to Flash firmware on Huawei Y7 Prime (TRTL21A):
Step 1: Create a new folder on your Micro SD Card and rename it to dload.
Step 2: Download and extract Huawei Smartphone firmware (for your device) on your Computer.
Step 3: Copy UPDATE.APP and paste it the dload folder on your Micro SD card.
Step 4: Power Off your Huawei Smartphone.
Step 5: Now, Press Volume UP, Volume Down and Power Button at the same time for 5-8 seconds until the update process is started automatically.
Step 6: Update Process may takes 5-10 minutes to complete.
Step 7: Once Update Process is completed your device will reboot automatically and ready to use.
Firmware via SD card update
https://shareaz.us/11620/trt-l21a-build-list/