[Honor 7 Q&A, Help & Troubleshooting] 0v3r cl0ck3d:
You can open the update.app in Huawei update extractor and use adb to manually flash the system, custom, cache, boot and recovery partitions back to stock then once you boot into the stock emui os you can reflash twrp. I'm busy atm but I'll write you a proper guide soon. Or you could Google it but be careful becuase there are a lot of guide that don't work anymore

Edit: This won't require you to wipe your user data so you can keep your setting contacts apps etc.

---------- Post added at 09:07 PM ---------- Previous post was at 08:28 PM ----------

Here is my guide it's a bit long but should be easy. I recommend reading it all first before following it just so you know what each step is doing.

Ok step one. Go to This link and download the emui version for you phone.

step two. You need to download Huawei update extractor from This link and install it on your pc.

Step three. unzip the update you extracted to a new folder on your desktop (It can be called anything bu I recommend calling it "EMUI") and put the update.app file in this folder.

Step four. open Huawei update extractor and select profile "Unknown (worstenbrood)" if it is not selected already.

Step five. Under the section where it says update file click on the ".." button navigate to the folder you made on your desktop and double click the update.app file.

Step six. Right click on the file named "BOOT.img" and click extract selected then once the green loading bar has gotten to 100% click close on the extracting window since it does not automatically do it its self.

Step seven. Repeat step six for the files named "CACHE.img", "CUST.img", "RECOVERY.img", "SYSTEM.img" and "USERDATA.img" (Only extract USERDATA.img if you want to wipe all of you apps, setting, contacts and messages)

Step eight. Open the folder you create on your desktop and copy all of the files you extracted (Only the .img files since Huawei update extractor also create some other files which you don't need) and paste them into the folder which you have adb installed into (It should be "C:\Program Files (x86)\Android\android-sdk\platform-tools" if you used the sdk version but if you have a diffrent version of adb paste them into the folder which you have that installed to)

Step nine. Boot your phone into bootloader mode on you phone. There are a few ways to do this but use whatever way you used when you flashed twrp.

step ten. In widowns explorer (Your pc's file manager) Shift click in the folder you have adb installed into and click "Open cmd window here"

Step eleven. type the following commands into cmd "fastboot flash boot BOOT.img", "fastboot flash cust CUST.img", "fastboot flash recovery RECOVERY.img", "fastboot flash system SYSTEM.img" and if you decided to reset all of you data (Like apps, contacts, messages, setting, etc) "fastboot flash userdata USERDATA.img" Some of these may take a long time (Especially SYSTEM.img but it shouldn't take more than 10 minute if it doesn't finish within 20 minute press ctrl + c in the cmd windows and start again).

Step twelve. Type "fastboot reboot" into cmd and you will boot into stock emui. Now you can reflash TWRP if you want and re install root.

Feel free to message me if you need help.