Huawei — honor 5x

My mum bought me a new huawei honor 5x when she went for shopping in china she them brought it home to nigeria. I connected to the internet input my gmail and some other important things like huawei id. It then brought the option o[censored]pdating my android 5.1 to marshmallow since i havent done much i decided to upgrade it and without having anything to backup i didnt bother. After the update was completed, it required the phone to restart which it started but instead of booting up it got stuck on the honor logo and it remained like this till the battery was empty i have searched everywhere for a solution but i get an option of resetting and wiping, hard resetting, and i have gotten far to as much a redownloading a new firmware on an sdcard for the phone and performing the three button install it only gets to about 15percent and tell me install failed i have also tried the e-recovery it tells me unable to get update package. Where i live in nigeria there is no near service center. My mum is not going back to china anytime soon and even if she does the warranty paper sticked to it was removed by me because i thought it was useless only to discover that its not afterall. Infact i have gone far as much as reading the post on fastboot and rescue mode which i acidentally stumbled upon. It tells me phone locked and i read the posts on how to unlock but i am afraid what of if it doesnt work and i loose the warranty. Even if it requires loosing the warranty i need step by step solution at any extent. I just need assurance it wont damage my device pls.