ok, i installed it. no issues so far!
installation instructions:
1. download (or update to the latest version) firmware finder
2. click search (bottom right corner)
3. click "BTV-W09C128B350" FullOTA
4. click register for update (beta)
5. copy DNS address (save it somewhere)
6. click register update
7. download and install "firmware finder proxy"
8. follow instructions in the firmware finder proxy app
9. go back to firmware finder and click "send firmware to updater"
10. go to huawei update (settings > updater)
11. click check for updates
12. download update (2.4 GB i think). click install and it will reboot.
10min later, it'll finish rebooting and you'll have nougat! the only thing wrong with it is it doesn't pass safetynet, so apps that check root may not work. exact status is:
safetynet response
cts profile match: false
basic integrity: true