How I can check if mine is Mib1 High?Unless it's a retrofit / fiddled one you can't do it. Maps are available for November 2019 release but I dont publish them since UK people are stuck. I'll edit the link in later but no easy DIY solutions. Its an area of retrofiters minting it in.
If it's a mib1 high then use the mib2 high one. Again that's a retrofit fix for those units to give it that capability.
If u could pass the link with maps from november 2019 will be great.