Hi fellows,
I am currently using UM S3. I found the active leveling of s3 (and many other functions) is really annoying. Too many points for correction and take a long time. I used to have a UM3, however, it is broken. So I bought a new S3. I am wondering if I could replace the current firmware of S3 with old firmware of UM3? Does anyone tried that? Thanks for your help, I really appreciate that.
John