Glad to help. If the rev B is another variety of S905 (x,w, etc) you’re in good shape, however you’ll almost certainly need to update to Android 7.1 or greater on the box for the bootloader to accommodate CE19+. The stock android 6 bootloader on boxes of this era isn’t up to the task. You’ll get quirky errors that randomly crash the OS at best and no ability to boot into CE at worst.
This is a lengthy read but worth your time as others on this page have gone through this process themselves: https://discourse.coreelec.org/t/testers-wanted-gxl-1gb-ram-devices-amlogic-ng/15877
Long story short, if your box is an S905(x,w, etc) you’ll likely be looking for something in and ATVxperience or Aidan’s Rom for the requisite boot loader.