@kjarak What I mean is since you seem to be the only one having this problem with v7.6 so far, it's very hard to find out if your problem is related to your phone or Fulmics v7.5/v7.6 update - only you could find it out after trying a few different versions of Fulmics on your phone. And yes, flashing modems can sometimes fix data/Wi-Fi/Bluetooth problems, but to be honest I don't know if it would help you in this case, man.
@AnthonyJRP post in English if possible - otherwise I can't help you as I don't understand Spanish. While I can't understand what's written in your phone's screen, you possibly have two chances: First, something went seriously wrong with the installation and
GMSCore.apk is not present
system/priv-app/GMSCore. To find if this is your problem, you need a file explorer with root explorer such as Amaze to check your phone. If this is the case, I suggest redownloading & reflashing the ROM. The second case could be a rare but ugly bug of Android which occured to me a long time ago when using Tekcafe. I flashed the ROM and a few days later, I suddenly started getting errors that Google Play Services was not installed on my phone, although the relevant APK was DEFINITELY present in its usual location, but somehow it wasn't shown in the installed apps list when I checked Apps > Settings. From what I see now, this problem possibly isn't specific to Fulmics or Tekcafe. Unfortunately the only cure I could find to this problem when using Tekcafe was wipe + reflash the ROM. You probably now have to do the same thing. I'm sorry, but that's how it's.