As a result of being rooted ( one important app needs it) I've been updating via CMD for months without any issues. I edit the .dat file to prevent wipe.
However since the last 2 updates this method results in errors both with CMD and Powershell. The most common error is being asked to update to latest Fastboot ( which it is).
Found a comment online to delete everything above the the "fastboot flash bootloader .....". This prevents it checking Fastboot version.
I did this and get these messages; "unknown option -- slot=other"
"unknown option -- set-active-other"
Any advice would be much appreciated.
Thanks.