I have rooted my Xperia Z1 Compact with Munjeni's Newroot Z1. Everything worked out fine as far as I can tell, I can gain root access in all applications and sending "su" in terminal emulator turns my shell into root@D5503, and the root status is confirmed by the "id -u" result "uid=0(root)".
However, despite of this apparent success I am unable to remount my system as read-writable. I tried using Fxplorer (fails to remount with 'The operation could not be completed", ES file explorer (fails without notice) and manually using terminal emulator. In the latter, I have tried numerous variations of the command "mount -o remount,rw /system", optionally with preceding "busybox". In either case I am getting errors like "mount: Operation not permitted" or "mount: permission denied (are you root?)".
I've tried to search the forum but most cases appear to be solved with users forgetting to "su" before the command or misspelling the mount command itself. I can assure you that my phone at least appeard to be in root mode when I tried to remount.
Any idea what I'm doing wrong? Has the rooting not been as successful as it seems? Thanks for your help!