You can use choidujournx
Man it was a long time doing it
And https://gbatemp.net/members/pretzal.469899/ this amazing man walked me through it
I did it through Choidujour the windows version and biskeys
And back to 5.2
Although I have another problem now which I can’t install 6.2 offline now using Choidujournx hp app
Sent you an update in discord that should get you back to 6.2, let me know how you get on