Returning to stock

Dear Community & fellow Honor 5X/GR5 users,

My device model is Huawei GR5 (KII-L21C636B130) variant.
I was running RR & for some reason need to return to stock.
but accidentally I lost my TWRP stock backup somehow.
It seems there are no stock twrp backup found for my variant.

I have official firmware package but how to I flash it from RR? any Idea?
Will volumeup+volunedown+power button combo work? I couldn't make it work though... flashed stock recovery too..
pardon me for stupid questions.

@clsA hoping if you could help .

TIA & Regards,
Mumith Ahmed

Returning my galaxy s3 to stock

While trying to put cm13 into galaxy s3 it bootlooped and the back up rom I made is not working (files not found). Meanwhile I found this tutorial and wanted your opinion on it but I cant post it yet.
This is the first time I did this and I really just want to return my phone to normal without paying 40 euros on repair

[HELP] Returning HTC One (M7) to Stock ROM

Hey guys, What's up?

First of all, I must mention what happened, I always had an iPhone, and I bought a HTC One (M7) like 2 years ago, and I never thought about rooting it..

One year ago, my friend suggested that he can upgrade it to Lollipop, and he seemed so confident lol, and I think he messed it up, I do have Lollipop on it, but it's SO BUGGY!, The phone gets so HOT easily! keeps crashing! and many many other problems..

So I decided to have the Stock ROM back, and I started reading how, but honestly, it's so difficult since I don't know what he has done to the phone..

The only thing I remember he did: He was coming to this forum and mentioned that this is the best forums for Android devs.. :)

So.. Can anyone please help me get my phone back to Stock ROM?
Tell me what to do first? What I need to have?
And most important, help me find the right files for my phone? :(

Thanks alot,
Have a nice day :)