Converting from APFS to Externtal Hard Drive
So, I updated my MacBook 2017 from High Seirra to Big Sur (because I wanted a system past 11.13 to download an app - but now I'm just doing to stick with 11.13) using an external drive and then immediately regretted it and turned back by re-staring and getting 11.13 back with back-ups using another external hard drive that is connected to a Time Machine.
I uploaded the big slur update to an external hard drive because I didn't have the memory on my Macintosh HD to do the update, but it caused my EHD to change to an APFS system.
Is there any way to convert my external hard drive back to its original volume?
Please let me know as I would like to consider all the options before buying a new EHD
MacBook