I don't know why but I did a 7-8 tries to install GApps and use them for for a few hours with this installer on own x650 for few last weeks. And there no any problem with Market. Yes, it's UNcertified, but it works good.
Also it was UNcertified for 3 last years at my old letv x600 device... and yes, it still works. I don't understand what is your problem.
I've solved this problem already by the way. By installing new firmware with this link https://drive.google.com/file/d/1X0BhNAIDrZ8-xlMfD0lgcY069ADwDDYg/view. This firmware version is much better than this 28s update on thia thread because with this new firmware I've installed I'm scoring a 114k antutu benchmark, while on my previous one which is on this thread my phone only scored 50k plus, but the eis here is not supported, and guys this firmware already has a Gapps preinatalled on it. So if you would like to try this, just download the link i gave. Just sharing this to you guys. Thanks by the way, still using the gapps and debloat to remove other bloatware apps.