Normally I would say, see the vu-hd.com site, but there are only some old versions to download for the X Solo mini 2. I think that it will hard to find newer image file, last image I see with google search are from 2014. Normally I would advice to upgrade the box with the Japhar chip so that you just can use the newest original solo image files. But if you think of doing that then I need at least a good picture from your motherboard to see if it may succeed.
It's the Xcard chip which maybe can be replaced for a Japhar chip, but to know it I need a good picture from the Xcard chip with the surrounding area. This to see if the scl/sda etc pins are the same as the Japhar chip. Other option could be to use the Japhar module version, then you can connect it with wires, only four wires needed to connect when the Xcard chip has been removed. But as for the image file, maybe if you search to Evoe3hd you may find some younger image files, but with a clone it seems to me a bit risky to search/use it this way.