I don’t know how to do this, maybe @hodin can help You with bios flash https://techtablets.com/forum/topic/yepo-737a-running-jumper-ezbook-3-pro-v4-bios/
My bios version is 2.18.1263, I have ezbook 3 pro v.4.
I had same situation, i buy 128 kingspec from aliexpress and cant found it in bios or device menager. THE SOLUTION is program “minitool partition wizard free”. Only minitool detect my ssd, i format it and migrate windows from build-in memory and evertyhing works well. You can find tutorials in google how to do this in minitool. Sorry for my english too 😛