So, the situation is as follows:

I have a MacBook Air 13'' (early 2015), which was corporate but the employer allowed me to buy it when I was changing jobs. I have installed Windows 10 from an official ISO, using Boot Camp Assistant. Everything went smooth, but now I can't boot back to OS X.

Windows Boot Camp helper can't find the OS X boot partition (AFAIK Boot Camp 6.0 doesn't support APFS). Booting into Boot Manager won't work because there is a password in place (didn't even bother touching it for years, didn't know it was there). I've tried installing Boot Manager 6.1 (which is told to have APFS support) using brigadier, but brigadier downloads 6.0 no matter what I try to do.

I have no means of contacting my previous employer and I have no proof of buying this Mac.

Is there anything I can do to boot back to OS X and/or fix the boot order?

The situation is as follows:

I have a MacBook Air 13" (early 2015), which was corporate but the employer allowed me to buy it when I was changing jobs. I have installed Windows 10 from an official ISO, using Boot Camp Assistant. Everything went smooth, but now I can't boot back to macOS.

Windows Boot Camp helper can't find the macOS boot partition (AFAIK Boot Camp 6.0 doesn't support APFS). Booting into Boot Manager won't work because there is a password in place (didn't even bother touching it for years, didn't know it was there). I've tried installing Boot Manager 6.1 (which is told to have APFS support) using brigadier, but brigadier downloads 6.0 no matter what I try to do.

I have no means of contacting my previous employer and I have no proof of buying this Mac.

Is there anything I can do to boot back to macOS and/or fix the boot order?