You don't seem to be familiar with how the rugged phone industry works. Here are a few observations I've made from my research:
- If you buy a rugged phone, the O/S version will never be updated. Some companies promise an update when the phone is first released, but they will never follow through. So if you buy a rugged phone with Android 8.1, it will remain at 8.1. Same with 9.0; the phone will never be upgraded to Android 10.0.
- You'll see some sporadic OTA security and bug fix updates in the first 6 months to a year after release, but after that they'll trickle of to mostly nothing. This may be because the company has moved on to the next phone release and all their effort is put into working on that phone's OS.
It doesn't matter what company it is: Blackview, Doogee, AGM, Ulefone, CAT, Sonim, Kyocera, etc., they all operate this way. If the phone works, has no major problems, and you can live with the lack of updates, then you should enjoy it for what it is. But it's something to keep in mind when looking into purchasing a rugged phone.