For those of you who have been unable to use the emulator within the B4A IDE, I just tried my emulator for the first time in a year or so and it worked. I've been using wired B4A-bridge or wifi bridge successfully. I recently updated my B4A version to 10.50. I don't know what happened but it's functioning for me again.
The issue wasn't fixed by updating to B4A 10.5, at some point in time you've obviously ran B4A SDK Manager and one of the updates fixed your emulator. After the emulator was updated (again) in the manager, the emulator started working again and that was while using B4A V10.2.