The problem with the less common devices is two-fold.
1- As you've found, the manufacturer rarely updates the device
2 - 3rd-party support for the device is minimal The most popular site where you'll find this (XDA) doesn't have a forum specifically for this device so that route is unlikely.
IF you could find a ROM for a newer OS on that device, you're most likely only going to find up to Marshmallow (Android 5), 6 or 7 is very unlikely.
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